diff --git a/doc/admin/config.rst b/doc/admin/config.rst
index 7825ee58f..ed4b4748d 100644
--- a/doc/admin/config.rst
+++ b/doc/admin/config.rst
@@ -27,8 +27,6 @@ Example::
     instance_name=pretix.de
     url=http://localhost
     currency=EUR
-    cookiedomain=.pretix.de
-    securecookie=on
     datadir=/data
     plugins_default=pretix.plugins.sendmail,pretix.plugins.statistics
 
@@ -41,13 +39,6 @@ Example::
 ``currency``
     The default currency as a three-letter code. Defaults to ``EUR``.
 
-``cookiedomain``
-    The domain to be used for session cookies, csrf protection cookies and locale cookies.
-    Empty by default.
-
-``securecookie``
-    Set the ``secure`` and ``httponly`` flags on session cookies. Off by default.
-
 ``datadir``
     The local path to a data directory that will be used for storing user uploads and similar
     data. Defaults to thea value of the environment variable ``DATA_DIR`` or ``data``.
diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index 8502ce0ac..c3fa9b77b 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -9,12 +9,11 @@ from pretix.base.models import (
     CartPosition, Event, EventLock, Order, OrderPosition, Quota,
 )
 from pretix.base.payment import BasePaymentProvider
-from pretix.base.services.cart import CartError
 from pretix.base.services.mail import mail
 from pretix.base.signals import (
     order_paid, order_placed, register_payment_providers,
 )
-from pretix.helpers.urls import build_absolute_uri
+from pretix.multidomain.urlreverse import build_absolute_uri
 
 error_messages = {
     'unavailable': _('Some of the products you selected were no longer available. '
@@ -68,9 +67,7 @@ def mark_order_paid(order: Order, provider: str=None, info: str=None, date: date
         {
             'order': order,
             'event': order.event,
-            'url': build_absolute_uri('presale:event.order', kwargs={
-                'event': order.event.slug,
-                'organizer': order.event.organizer.slug,
+            'url': build_absolute_uri(order.event, 'presale:event.order', kwargs={
                 'order': order.code,
                 'secret': order.secret
             }),
@@ -189,9 +186,7 @@ def _perform_order(event: Event, payment_provider: BasePaymentProvider, position
             {
                 'order': order,
                 'event': event,
-                'url': build_absolute_uri('presale:event.order', kwargs={
-                    'event': event.slug,
-                    'organizer': event.organizer.slug,
+                'url': build_absolute_uri(event, 'presale:event.order', kwargs={
                     'order': order.code,
                     'secret': order.secret
                 }),
diff --git a/src/pretix/control/middleware.py b/src/pretix/control/middleware.py
index 1e8042645..35030d2e2 100644
--- a/src/pretix/control/middleware.py
+++ b/src/pretix/control/middleware.py
@@ -1,10 +1,10 @@
-from urllib.parse import urlparse
+from urllib.parse import urljoin, urlparse
 
 from django.conf import settings
 from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.core.urlresolvers import get_script_prefix, resolve
 from django.http import Http404
-from django.shortcuts import resolve_url
+from django.shortcuts import redirect, resolve_url
 from django.utils.encoding import force_str
 from django.utils.translation import ugettext as _
 
@@ -28,7 +28,13 @@ class PermissionMiddleware:
     def process_request(self, request):
         url = resolve(request.path_info)
         url_name = url.url_name
-        if not request.path.startswith(get_script_prefix() + 'control') or url_name in self.EXCEPTIONS:
+        if not request.path.startswith(get_script_prefix() + 'control'):
+            # This middleware should only touch the /control subpath
+            return
+        if hasattr(request, 'domain'):
+            # If the user is on a organizer's subdomain, he sould be redirected to pretix
+            return redirect(urljoin(settings.SITE_URL, request.get_full_path()))
+        if url_name in self.EXCEPTIONS:
             return
         if not request.user.is_authenticated():
             # Taken from django/contrib/auth/decorators.py
diff --git a/src/pretix/multidomain/__init__.py b/src/pretix/multidomain/__init__.py
new file mode 100644
index 000000000..b051cac35
--- /dev/null
+++ b/src/pretix/multidomain/__init__.py
@@ -0,0 +1,8 @@
+from django.apps import AppConfig
+
+
+class PretixMultidomainConfig(AppConfig):
+    name = 'pretix.multidomain'
+    label = 'pretixmultidomain'
+
+default_app_config = 'pretix.multidomain.PretixMultidomainConfig'
diff --git a/src/pretix/multidomain/middlewares.py b/src/pretix/multidomain/middlewares.py
new file mode 100644
index 000000000..362fa8922
--- /dev/null
+++ b/src/pretix/multidomain/middlewares.py
@@ -0,0 +1,112 @@
+import time
+from urllib.parse import urlparse
+
+from django.conf import settings
+from django.contrib.sessions.middleware import \
+    SessionMiddleware as BaseSessionMiddleware
+from django.core.exceptions import DisallowedHost
+from django.http.request import split_domain_port
+from django.middleware.csrf import CsrfViewMiddleware as BaseCsrfMiddleware
+from django.utils.cache import patch_vary_headers
+from django.utils.http import cookie_date
+
+from pretix.multidomain.models import KnownDomain
+
+
+class MultiDomainMiddleware:
+    def process_request(self, request):
+        # We try three options, in order of decreasing preference.
+        if settings.USE_X_FORWARDED_HOST and ('HTTP_X_FORWARDED_HOST' in request.META):
+            host = request.META['HTTP_X_FORWARDED_HOST']
+        elif 'HTTP_HOST' in request.META:
+            host = request.META['HTTP_HOST']
+        else:
+            # Reconstruct the host using the algorithm from PEP 333.
+            host = request.META['SERVER_NAME']
+            server_port = str(request.META['SERVER_PORT'])
+            if server_port != ('443' if request.is_secure() else '80'):
+                host = '%s:%s' % (host, server_port)
+
+        domain, port = split_domain_port(host)
+        default_domain, default_port = split_domain_port(urlparse(settings.SITE_URL).netloc)
+        if domain:
+            request.host = domain
+            request.port = int(port) if port else None
+            try:
+                kd = KnownDomain.objects.get(domainname=domain)  # noqa
+                request.domain = kd
+            except:
+                if settings.DEBUG or domain in ('testserver', 'localhost') or domain == default_domain:
+                    return  # TODO: Select main page
+                raise DisallowedHost("Unknown host: %r" % host)
+            else:
+                request.organizer = kd.organizer
+        else:
+            raise DisallowedHost("Invalid HTTP_HOST header: %r." % host)
+
+
+class SessionMiddleware(BaseSessionMiddleware):
+    def process_response(self, request, response):
+        try:
+            accessed = request.session.accessed
+            modified = request.session.modified
+            empty = request.session.is_empty()
+        except AttributeError:
+            pass
+        else:
+            # First check if we need to delete this cookie.
+            # The session should be deleted only if the session is entirely empty
+            if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
+                response.delete_cookie(settings.SESSION_COOKIE_NAME)
+            else:
+                if accessed:
+                    patch_vary_headers(response, ('Cookie',))
+                if modified or settings.SESSION_SAVE_EVERY_REQUEST:
+                    if request.session.get_expire_at_browser_close():
+                        max_age = None
+                        expires = None
+                    else:
+                        max_age = request.session.get_expiry_age()
+                        expires_time = time.time() + max_age
+                        expires = cookie_date(expires_time)
+                    # Save the session data and refresh the client cookie.
+                    # Skip session save for 500 responses, refs #3881.
+                    if response.status_code != 500:
+                        request.session.save()
+                        response.set_cookie(settings.SESSION_COOKIE_NAME,
+                                            request.session.session_key, max_age=max_age,
+                                            expires=expires, domain=request.host,
+                                            path=settings.SESSION_COOKIE_PATH,
+                                            secure=request.scheme == 'https',
+                                            httponly=settings.SESSION_COOKIE_HTTPONLY or None)
+        return response
+
+
+class CsrfViewMiddleware(BaseCsrfMiddleware):
+    def process_response(self, request, response):
+        if getattr(response, 'csrf_processing_done', False):
+            return response
+
+        # If CSRF_COOKIE is unset, then CsrfViewMiddleware.process_view was
+        # never called, probably because a request middleware returned a response
+        # (for example, contrib.auth redirecting to a login page).
+        if request.META.get("CSRF_COOKIE") is None:
+            return response
+
+        if not request.META.get("CSRF_COOKIE_USED", False):
+            return response
+
+        # Set the CSRF cookie even if it's already set, so we renew
+        # the expiry timer.
+        response.set_cookie(settings.CSRF_COOKIE_NAME,
+                            request.META["CSRF_COOKIE"],
+                            max_age=settings.CSRF_COOKIE_AGE,
+                            domain=request.host,
+                            path=settings.CSRF_COOKIE_PATH,
+                            secure=request.scheme == 'https',
+                            httponly=settings.CSRF_COOKIE_HTTPONLY
+                            )
+        # Content varies with the CSRF cookie, so set the Vary header.
+        patch_vary_headers(response, ('Cookie',))
+        response.csrf_processing_done = True
+        return response
diff --git a/src/pretix/multidomain/migrations/0001_initial.py b/src/pretix/multidomain/migrations/0001_initial.py
new file mode 100644
index 000000000..08f438626
--- /dev/null
+++ b/src/pretix/multidomain/migrations/0001_initial.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import versions.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='KnownDomain',
+            fields=[
+                ('domainname', models.CharField(serialize=False, max_length=255, primary_key=True)),
+                ('organizer', versions.models.VersionedForeignKey(blank=True, to='pretixbase.Organizer', null=True)),
+            ],
+        ),
+    ]
diff --git a/src/pretix/multidomain/migrations/0002_auto_20151018_1007.py b/src/pretix/multidomain/migrations/0002_auto_20151018_1007.py
new file mode 100644
index 000000000..b3545a167
--- /dev/null
+++ b/src/pretix/multidomain/migrations/0002_auto_20151018_1007.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import versions.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixmultidomain', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='knowndomain',
+            options={'verbose_name': 'Known domain', 'verbose_name_plural': 'Known domains'},
+        ),
+        migrations.AlterField(
+            model_name='knowndomain',
+            name='organizer',
+            field=versions.models.VersionedForeignKey(to='pretixbase.Organizer', null=True, related_name='domains', blank=True),
+        ),
+    ]
diff --git a/src/pretix/multidomain/migrations/__init__.py b/src/pretix/multidomain/migrations/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/pretix/multidomain/models.py b/src/pretix/multidomain/models.py
new file mode 100644
index 000000000..ce7dfdd7f
--- /dev/null
+++ b/src/pretix/multidomain/models.py
@@ -0,0 +1,27 @@
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+from versions.models import VersionedForeignKey
+
+from pretix.base.models import Organizer
+
+
+class KnownDomain(models.Model):
+    domainname = models.CharField(max_length=255, primary_key=True)
+    organizer = VersionedForeignKey(Organizer, blank=True, null=True, related_name='domains')
+
+    class Meta:
+        verbose_name = _("Known domain")
+        verbose_name_plural = _("Known domains")
+
+    def __str__(self):
+        return self.domainname
+
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+        if self.organizer:
+            self.organizer.get_cache().clear()
+
+    def delete(self, *args, **kwargs):
+        if self.organizer:
+            self.organizer.get_cache().clear()
+        super().delete(*args, **kwargs)
diff --git a/src/pretix/multidomain/templatetags/__init__.py b/src/pretix/multidomain/templatetags/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/pretix/multidomain/templatetags/eventurl.py b/src/pretix/multidomain/templatetags/eventurl.py
new file mode 100644
index 000000000..2dc5fbd0f
--- /dev/null
+++ b/src/pretix/multidomain/templatetags/eventurl.py
@@ -0,0 +1,71 @@
+from django import template
+from django.core.urlresolvers import NoReverseMatch
+from django.template import TemplateSyntaxError
+from django.template.base import kwarg_re
+from django.template.defaulttags import URLNode
+from django.utils.encoding import smart_text
+from django.utils.html import conditional_escape
+
+register = template.Library()
+
+
+class EventURLNode(URLNode):
+    def __init__(self, event, view_name, kwargs, asvar):
+        self.event = event
+        super().__init__(view_name, [], kwargs, asvar)
+
+    def render(self, context):
+        from pretix.multidomain.urlreverse import eventreverse
+        kwargs = {
+            smart_text(k, 'ascii'): v.resolve(context)
+            for k, v in self.kwargs.items()
+        }
+        view_name = self.view_name.resolve(context)
+        event = self.event.resolve(context)
+        url = ''
+        try:
+            url = eventreverse(event, view_name, kwargs=kwargs)
+        except NoReverseMatch:
+            if self.asvar is None:
+                raise
+
+        if self.asvar:
+            context[self.asvar] = url
+            return ''
+        else:
+            if context.autoescape:
+                url = conditional_escape(url)
+            return url
+
+
+@register.tag
+def eventurl(parser, token):
+    """
+    Similar to {% url %} in the same way that eventreverse() is similar to reverse().
+
+    Takes an event object, an url name and optional keyword arguments
+    """
+    bits = token.split_contents()
+    if len(bits) < 3:
+        raise TemplateSyntaxError("'%s' takes at least one argument, an event and the name of a url()." % bits[0])
+    viewname = parser.compile_filter(bits[2])
+    event = parser.compile_filter(bits[1])
+    kwargs = {}
+    asvar = None
+    bits = bits[3:]
+    if len(bits) >= 3 and bits[-2] == 'as':
+        asvar = bits[-1]
+        bits = bits[:-2]
+
+    if len(bits):
+        for bit in bits:
+            match = kwarg_re.match(bit)
+            if not match:
+                raise TemplateSyntaxError("Malformed arguments to eventurl tag")
+            name, value = match.groups()
+            if name:
+                kwargs[name] = parser.compile_filter(value)
+            else:
+                raise TemplateSyntaxError('Event urls only have keyword arguments.')
+
+    return EventURLNode(event, viewname, kwargs, asvar)
diff --git a/src/pretix/multidomain/urlreverse.py b/src/pretix/multidomain/urlreverse.py
new file mode 100644
index 000000000..208326a2b
--- /dev/null
+++ b/src/pretix/multidomain/urlreverse.py
@@ -0,0 +1,44 @@
+from urllib.parse import urljoin, urlsplit
+
+from django.conf import settings
+from django.core.urlresolvers import reverse
+
+
+def get_domain(event):
+    c = event.organizer.get_cache()
+    domain = c.get('domain')
+    if domain is None:
+        domains = event.organizer.domains.all()
+        domain = domains[0].domainname if domains else None
+        c.set('domain', domain or 'none')
+    elif domain == 'none':
+        return None
+    return domain
+
+
+def eventreverse(event, name, kwargs=None):
+    """
+    Works similar to django.core.urlresolvers.reverse but takes into account that some
+    organizers might have their own (sub)domain instead of a subpath.
+    """
+    kwargs = kwargs or {}
+    kwargs['event'] = event.slug
+    domain = get_domain(event)
+    if domain:
+        if 'organizer' in kwargs:
+            del kwargs['organizer']
+        path = reverse(name, kwargs=kwargs)
+        siteurlsplit = urlsplit(settings.SITE_URL)
+        if siteurlsplit.port and siteurlsplit.port not in (80, 443):
+            domain = '%s:%d' % (domain, siteurlsplit.port)
+        return urljoin('%s://%s' % (siteurlsplit.scheme, domain), path)
+
+    kwargs['organizer'] = event.organizer.slug
+    return reverse(name, kwargs=kwargs)
+
+
+def build_absolute_uri(event, urlname, kwargs=None):
+    reversedurl = eventreverse(event, urlname, kwargs)
+    if '://' in reversedurl:
+        return reversedurl
+    return urljoin(settings.SITE_URL, reversedurl)
diff --git a/src/pretix/plugins/paypal/payment.py b/src/pretix/plugins/paypal/payment.py
index 711ef37b0..cc6d3a1fd 100644
--- a/src/pretix/plugins/paypal/payment.py
+++ b/src/pretix/plugins/paypal/payment.py
@@ -11,7 +11,7 @@ from django.utils.translation import ugettext as __, ugettext_lazy as _
 from pretix.base.models import Quota
 from pretix.base.payment import BasePaymentProvider
 from pretix.base.services.orders import mark_order_paid
-from pretix.helpers.urls import build_absolute_uri
+from pretix.multidomain.urlreverse import build_absolute_uri
 
 logger = logging.getLogger('pretix.plugins.paypal')
 
@@ -87,8 +87,8 @@ class Paypal(BasePaymentProvider):
                 "payment_method": "paypal",
             },
             "redirect_urls": {
-                "return_url": build_absolute_uri('plugins:paypal:return'),
-                "cancel_url": build_absolute_uri('plugins:paypal:abort'),
+                "return_url": build_absolute_uri(request.event, 'plugins:paypal:return'),
+                "cancel_url": build_absolute_uri(request.event, 'plugins:paypal:abort'),
             },
             "transactions": [
                 {
diff --git a/src/pretix/plugins/paypal/urls.py b/src/pretix/plugins/paypal/urls.py
index 5ede8ffac..43e0b31de 100644
--- a/src/pretix/plugins/paypal/urls.py
+++ b/src/pretix/plugins/paypal/urls.py
@@ -3,7 +3,7 @@ from django.conf.urls import include, url
 from .views import abort, retry, success
 
 urlpatterns = [
-    url(r'^paypal/', include([
+    url(r'^(?:(?P<organizer>[^/]+)/)?(?P<event>[^/]+)/paypal/', include([
         url(r'^abort/$', abort, name='abort'),
         url(r'^return/$', success, name='return'),
         url(r'^retry/(?P<order>[^/]+)/', retry, name='retry')
diff --git a/src/pretix/plugins/paypal/views.py b/src/pretix/plugins/paypal/views.py
index b79731ad4..4ef3c32c5 100644
--- a/src/pretix/plugins/paypal/views.py
+++ b/src/pretix/plugins/paypal/views.py
@@ -8,6 +8,7 @@ from django.utils.translation import ugettext as __, ugettext_lazy as _
 
 from pretix.base.models import Event, Order
 from pretix.helpers.urls import build_absolute_uri
+from pretix.multidomain.urlreverse import eventreverse
 from pretix.plugins.paypal.payment import Paypal
 
 logger = logging.getLogger('pretix.plugins.paypal')
@@ -23,10 +24,7 @@ def success(request):
         request.session['payment_paypal_payer'] = payer
         try:
             event = Event.objects.current.get(identity=request.session['payment_paypal_event'])
-            return redirect('presale:event.checkout',
-                            event=event.slug,
-                            organizer=event.organizer.slug,
-                            step='confirm')
+            return redirect(eventreverse(event, 'presale:event.checkout', kwargs={'step': 'confirm'}))
         except Event.DoesNotExist:
             pass  # TODO: Handle this
     else:
@@ -38,10 +36,7 @@ def abort(request):
     messages.error(request, _('It looks like you cancelled the PayPal payment'))
     try:
         event = Event.objects.current.get(identity=request.session['payment_paypal_event'])
-        return redirect('presale:event.checkout',
-                        event=event.slug,
-                        organizer=event.organizer.slug,
-                        step='payment')
+        return redirect(eventreverse(event, 'presale:event.checkout', kwargs={'step': 'payment'}))
     except Event.DoesNotExist:
         pass  # TODO: Handle this
 
@@ -103,8 +98,7 @@ def retry(request, order):
         if resp:
             return redirect(resp)
 
-    return redirect('presale:event.order',
-                    event=order.event.slug,
-                    organizer=order.event.organizer.slug,
-                    order=order.code,
-                    secret=order.secret) + '?paid=yes'
+    return redirect(eventreverse(order.event, 'presale:event.order', kwargs={
+        'order': order.code,
+        'secret': order.secret
+    }) + '?paid=yes')
diff --git a/src/pretix/presale/checkoutflow.py b/src/pretix/presale/checkoutflow.py
index 79ea409e3..c375f131e 100644
--- a/src/pretix/presale/checkoutflow.py
+++ b/src/pretix/presale/checkoutflow.py
@@ -1,7 +1,6 @@
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import ValidationError
-from django.core.urlresolvers import reverse
 from django.core.validators import EmailValidator
 from django.db.models import Q, Sum
 from django.http import HttpResponseNotAllowed
@@ -14,6 +13,7 @@ from django.views.generic.base import TemplateResponseMixin
 from pretix.base.models import CartPosition, Order
 from pretix.base.services.orders import OrderError, perform_order
 from pretix.base.signals import register_payment_providers
+from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.forms.checkout import ContactForm
 from pretix.presale.signals import checkout_flow_steps
 from pretix.presale.views import CartMixin
@@ -59,32 +59,19 @@ class BaseCheckoutFlowStep:
         return HttpResponseNotAllowed([])
 
     def get_step_url(self):
-        return reverse(
-            'presale:event.checkout',
-            kwargs={
-                'event': self.event.slug,
-                'organizer': self.event.organizer.slug,
-                'step': self.identifier
-            }
-        )
+        return eventreverse(self.event, 'presale:event.checkout', kwargs={'step': self.identifier})
 
     def get_prev_url(self, request):
         prev = self.get_prev_applicable(request)
         if not prev:
-            return reverse('presale:event.index', kwargs={
-                'event': self.request.event.slug,
-                'organizer': self.request.event.organizer.slug
-            })
+            return eventreverse(self.event, 'presale:event.index')
         else:
             return prev.get_step_url()
 
     def get_next_url(self, request):
         n = self.get_next_applicable(request)
         if not n:
-            return reverse('presale:event.checkout.confirm', kwargs={
-                'event': self.request.event.slug,
-                'organizer': self.request.event.organizer.slug
-            })
+            return eventreverse(self.event, 'presale:event.checkout.confirm')
         else:
             return n.get_step_url()
 
@@ -342,9 +329,7 @@ class ConfirmStep(CartMixin, AsyncAction, TemplateFlowStep):
         return self.get_step_url()
 
     def get_order_url(self, order):
-        return reverse('presale:event.order.pay.complete', kwargs={
-            'event': self.request.event.slug,
-            'organizer': self.request.event.organizer.slug,
+        return eventreverse(self.request.event, 'presale:event.order.pay.complete', kwargs={
             'order': order.code,
             'secret': order.secret
         })
diff --git a/src/pretix/presale/middleware.py b/src/pretix/presale/middleware.py
index 02576b54d..69341a7b9 100644
--- a/src/pretix/presale/middleware.py
+++ b/src/pretix/presale/middleware.py
@@ -1,8 +1,12 @@
+from urllib.parse import urljoin
+
 from django.core.urlresolvers import resolve
 from django.http import Http404
+from django.shortcuts import redirect
 from django.utils.translation import ugettext_lazy as _
 
 from pretix.base.models import Event
+from pretix.multidomain.urlreverse import get_domain
 
 
 class EventMiddleware:
@@ -15,10 +19,36 @@ class EventMiddleware:
 
         if 'event.' in url_name and 'event' in url.kwargs:
             try:
-                request.event = Event.objects.current.filter(
-                    slug=url.kwargs['event'],
-                    organizer__slug=url.kwargs['organizer'],
-                ).select_related('organizer')[0]
+                if hasattr(request, 'organizer'):
+                    # We are on an organizer's custom domain
+                    if 'organizer' in url.kwargs and url.kwargs['organizer']:
+                        if url.kwargs['organizer'] != request.organizer.slug:
+                            raise Http404(_('The selected event was not found.'))
+                        path = "/" + request.get_full_path().split("/", 2)[-1]
+                        return redirect(path)
+
+                    request.event = Event.objects.current.filter(
+                        slug=url.kwargs['event'],
+                        organizer=request.organizer,
+                    ).select_related('organizer')[0]
+                else:
+                    # We are on our main domain
+                    if 'organizer' not in url.kwargs:
+                        raise Http404(_('The selected event was not found.'))
+
+                    request.event = Event.objects.current.filter(
+                        slug=url.kwargs['event'],
+                        organizer__slug=url.kwargs['organizer']
+                    ).select_related('organizer')[0]
+
+                    # If this organizer has a custom domain, send the user there
+                    domain = get_domain(request.event)
+                    if domain:
+                        if request.port and request.port not in (80, 443):
+                            domain = '%s:%d' % (domain, request.port)
+                        path = request.get_full_path().split("/", 2)[-1]
+                        return redirect(urljoin('%s://%s' % (request.scheme, domain), path))
+
             except IndexError:
                 raise Http404(_('The selected event was not found.'))
 
diff --git a/src/pretix/presale/templates/pretixpresale/event/base.html b/src/pretix/presale/templates/pretixpresale/event/base.html
index 85706dab8..b7b7520f2 100644
--- a/src/pretix/presale/templates/pretixpresale/event/base.html
+++ b/src/pretix/presale/templates/pretixpresale/event/base.html
@@ -1,6 +1,7 @@
 {% load compress %}
 {% load staticfiles %}
 {% load i18n %}
+{% load eventurl %}
 <!DOCTYPE html>
 <html>
 <head>
@@ -22,7 +23,7 @@
 <div class="container event">
     <div class="page-header">
         <h1 class="pull-left">
-            <a href="{% url "presale:event.index" event=event.slug organizer=event.organizer.slug %}">{{ event.name }}</a>
+            <a href="{% eventurl event "presale:event.index" %}">{{ event.name }}</a>
             <small>{{ event.date_from|date:"DATE_FORMAT" }}{% if event.settings.show_date_to %} – {{ event.date_to|date:"DATE_FORMAT" }}{% endif %}</small>
         </h1>
         <div class="pull-right loginbox">
diff --git a/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html b/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
index a16a0dad5..be9c5ff92 100644
--- a/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
+++ b/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
@@ -1,6 +1,7 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
+{% load eventurl %}
 {% block title %}{% trans "Confirm order" %}{% endblock %}
 {% block content %}
     <h2>{% trans "Confirm order" %}</h2>
@@ -11,7 +12,7 @@
             <div class="panel-heading">
                 <div class="pull-right">
                     <a href="
-                    {% url "presale:event.index" organizer=request.event.organizer.slug  event=request.event.slug %}">
+                    {% eventurl request.event "presale:event.index" %}">
                         <span class="fa fa-edit"></span>
                         {% trans "Modify" %}
                     </a>
@@ -41,7 +42,7 @@
                 <div class="panel-heading">
                     {% if payment_provider.identifier != "free" %}
                         <div class="pull-right">
-                            <a href="{% url "presale:event.checkout" step="payment" organizer=request.event.organizer.slug  event=request.event.slug %}">
+                            <a href="{% eventurl request.event "presale:event.checkout" step="payment" %}">
                                 <span class="fa fa-edit"></span>
                                 {% trans "Modify" %}
                             </a>
@@ -59,7 +60,7 @@
                 <div class="panel panel-primary panel-contact">
                     <div class="panel-heading">
                         <div class="pull-right">
-                            <a href="{% url "presale:event.checkout" step="questions" organizer=request.event.organizer.slug  event=request.event.slug %}">
+                            <a href="{% eventurl request.event "presale:event.checkout" step="questions" %}">
                                 <span class="fa fa-edit"></span>
                                 {% trans "Modify" %}
                             </a>
diff --git a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
index 235b797a0..f8fd57c87 100644
--- a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
+++ b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
@@ -1,4 +1,5 @@
 {% load i18n %}
+{% load eventurl %}
 {% for line in cart.positions %}
     <div class="row-fluid cart-row">
         <div class="col-md-4 col-xs-6">
@@ -21,7 +22,7 @@
         </div>
         <div class="col-md-2 col-xs-6 count">
             {% if editable %}
-            <form action="{% url "presale:event.cart.remove" event=event.slug organizer=event.organizer.slug %}"
+            <form action="{% eventurl event "presale:event.cart.remove" %}"
                     method="post">
                 {% csrf_token %}
                 {% if line.variation %}
@@ -36,7 +37,7 @@
             {% endif %}
             {{ line.count }}
             {% if editable %}
-            <form action="{% url "presale:event.cart.add" event=event.slug organizer=event.organizer.slug %}"
+            <form action="{% eventurl event "presale:event.cart.add" %}"
                 method="post" data-asynctask>
                 {% csrf_token %}
                 {% if line.variation %}
diff --git a/src/pretix/presale/templates/pretixpresale/event/index.html b/src/pretix/presale/templates/pretixpresale/event/index.html
index 6cc5c6604..ebaec7c04 100644
--- a/src/pretix/presale/templates/pretixpresale/event/index.html
+++ b/src/pretix/presale/templates/pretixpresale/event/index.html
@@ -1,5 +1,6 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
+{% load eventurl %}
 {% load thumbnail %}
 {% block title %}{% trans "Presale" %}{% endblock %}
 
@@ -23,7 +24,7 @@
                 </div>
                 <div class="col-md-4 col-md-offset-2 col-xs-12">
                     <a class="btn btn-block btn-primary btn-lg"
-                            href="{% url "presale:event.checkout.start" organizer=request.event.organizer.slug event=request.event.slug %}">
+                            href="{% eventurl request.event "presale:event.checkout.start" %}">
                         <i class="fa fa-shopping-cart"></i> {% trans "Proceed with checkout" %}
                     </a>
                 </div>
@@ -51,7 +52,7 @@
     {% endif %}
     {% if event.presale_is_running or event.settings.show_items_outside_presale_period %}
         <form method="post" data-asynctask
-                action="{% url "presale:event.cart.add" organizer=request.event.organizer.slug event=request.event.slug %}?next={{ request.path|urlencode }}">
+                action="{% eventurl request.event "presale:event.cart.add" %}?next={{ request.path|urlencode }}">
             {% csrf_token %}
             {% for tup in items_by_category %}
                 <section>
diff --git a/src/pretix/presale/templates/pretixpresale/event/order.html b/src/pretix/presale/templates/pretixpresale/event/order.html
index 450933cc9..e3b5e1e9c 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order.html
@@ -1,6 +1,7 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
+{% load eventurl %}
 {% block title %}{% trans "Order details" %}{% endblock %}
 {% block content %}
     {% if "thanks" in request.GET or "paid" in request.GET %}
@@ -32,7 +33,7 @@
             </div>
             <div class="panel-body">
                 {% if can_retry %}
-                    <a href="{% url "presale:event.order.pay" organizer=request.event.organizer.slug event=request.event.slug secret=order.secret order=order.code %}"
+                    <a href="{% eventurl event "presale:event.order.pay" secret=order.secret order=order.code %}"
                             class="btn btn-primary pull-right"><i class="fa fa-money"></i> {% trans "Complete payment" %}
                     </a>
                 {% endif %}
@@ -59,7 +60,7 @@
                         {% endblocktrans %}
                     </p>
                     {% for b in download_buttons %}
-                        <a href="{% url "presale:event.order.download" organizer=request.event.organizer.slug event=request.event.slug secret=order.secret order=order.code output=b.identifier %}"
+                        <a href="{% eventurl event "presale:event.order.download" secret=order.secret order=order.code output=b.identifier %}"
                                 class="btn btn-primary">
                             <span class="fa {{ b.icon }}"></span> {{ b.text }}
                         </a>
@@ -76,7 +77,7 @@
         <div class="panel-heading">
             {% if order.can_modify_answers %}
                 <div class="pull-right">
-                    <a href="{% url "presale:event.order.modify" organizer=request.event.organizer.slug event=request.event.slug secret=order.secret order=order.code %}">
+                    <a href="{% eventurl event "presale:event.order.modify" secret=order.secret order=order.code %}">
                         <span class="fa fa-edit"></span>
                         {% trans "Change details" %}
                     </a>
@@ -94,7 +95,7 @@
         <div class="row">
             <div class="col-md-12 text-right">
                 <p>
-                    <a href="{% url 'presale:event.order.cancel' event=request.event.slug organizer=request.event.organizer.slug secret=order.secret order=order.code %}"
+                    <a href="{% eventurl event 'presale:event.order.cancel' secret=order.secret order=order.code %}"
                             class="btn btn-danger">
                         <span class="fa fa-remove"></span>
                         {% trans "Cancel order" %}
diff --git a/src/pretix/presale/templates/pretixpresale/event/order_cancel.html b/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
index 08ef4fb95..fe4214d63 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
@@ -1,5 +1,6 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
+{% load eventurl %}
 {% block title %}{% trans "Cancel order" %}{% endblock %}
 {% block content %}
     <h2>
@@ -16,7 +17,7 @@
         <div class="row checkout-button-row">
             <div class="col-md-4">
                 <a class="btn btn-block btn-default btn-lg"
-                   href="{% url "presale:event.order" event=request.event.slug organizer=request.event.organizer.slug secret=order.secret order=order.code %}">
+                   href="{% eventurl request.event "presale:event.order" secret=order.secret order=order.code %}">
                     {% trans "No, take me back" %}
                 </a>
             </div>
diff --git a/src/pretix/presale/templates/pretixpresale/event/order_pay.html b/src/pretix/presale/templates/pretixpresale/event/order_pay.html
index c489f2ed3..a6e80fdbb 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order_pay.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order_pay.html
@@ -1,5 +1,6 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
+{% load eventurl %}
 {% block title %}{% trans "Pay order" %}{% endblock %}
 {% block content %}
     <h2>
@@ -16,7 +17,7 @@
         <div class="row checkout-button-row">
             <div class="col-md-4">
                 <a class="btn btn-block btn-default btn-lg"
-                   href="{% url "presale:event.order" event=request.event.slug organizer=request.event.organizer.slug secret=order.secret order=order.code %}">
+                   href="{% eventurl request.event "presale:event.order" secret=order.secret order=order.code %}">
                     {% trans "Cancel" %}
                 </a>
             </div>
diff --git a/src/pretix/presale/templates/pretixpresale/event/order_pay_confirm.html b/src/pretix/presale/templates/pretixpresale/event/order_pay_confirm.html
index 8992bf2ab..c42d69f1c 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order_pay_confirm.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order_pay_confirm.html
@@ -1,5 +1,6 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
+{% load eventurl %}
 {% block title %}{% trans "Pay order" %}{% endblock %}
 {% block content %}
     <h2>
@@ -27,7 +28,7 @@
         <div class="row checkout-button-row">
             <div class="col-md-4">
                 <a class="btn btn-block btn-default btn-lg"
-                   href="{% url "presale:event.order" event=request.event.slug organizer=request.event.organizer.slug secret=order.secret order=order.code %}">
+                   href="{% eventurl request.event "presale:event.order" secret=order.secret order=order.code %}">
                     {% trans "Cancel" %}
                 </a>
             </div>
diff --git a/src/pretix/presale/urls.py b/src/pretix/presale/urls.py
index 885ac7afa..edafbabf6 100644
--- a/src/pretix/presale/urls.py
+++ b/src/pretix/presale/urls.py
@@ -6,33 +6,36 @@ import pretix.presale.views.event
 import pretix.presale.views.locale
 import pretix.presale.views.order
 
-urlpatterns = [
-    url(r'^(?P<organizer>[^/]+)/(?P<event>[^/]+)/', include([
-        url(r'^$', pretix.presale.views.event.EventIndex.as_view(), name='event.index'),
-        url(r'^cart/add$', pretix.presale.views.cart.CartAdd.as_view(), name='event.cart.add'),
-        url(r'^cart/remove$', pretix.presale.views.cart.CartRemove.as_view(), name='event.cart.remove'),
-        url(r'^checkout/$', pretix.presale.views.checkout.CheckoutView.as_view(), name='event.checkout.start'),
-        url(r'^checkout/(?P<step>[^/]+)/$', pretix.presale.views.checkout.CheckoutView.as_view(),
-            name='event.checkout'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/$', pretix.presale.views.order.OrderDetails.as_view(),
-            name='event.order'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/cancel$',
-            pretix.presale.views.order.OrderCancel.as_view(),
-            name='event.order.cancel'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/modify$',
-            pretix.presale.views.order.OrderModify.as_view(),
-            name='event.order.modify'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay$', pretix.presale.views.order.OrderPay.as_view(),
-            name='event.order.pay'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay/confirm$',
-            pretix.presale.views.order.OrderPayDo.as_view(),
-            name='event.order.pay.confirm'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay/complete$',
-            pretix.presale.views.order.OrderPayComplete.as_view(),
-            name='event.order.pay.complete'),
-        url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/download/(?P<output>[^/]+)$',
-            pretix.presale.views.order.OrderDownload.as_view(),
-            name='event.order.download'),
-    ])),
-    url(r'^locale/set$', pretix.presale.views.locale.LocaleSet.as_view(), name='locale.set'),
+eventurls = [
+    url(r'^cart/add$', pretix.presale.views.cart.CartAdd.as_view(), name='event.cart.add'),
+    url(r'^cart/remove$', pretix.presale.views.cart.CartRemove.as_view(), name='event.cart.remove'),
+    url(r'^checkout/start$', pretix.presale.views.checkout.CheckoutView.as_view(), name='event.checkout.start'),
+    url(r'^checkout/(?P<step>[^/]+)/$', pretix.presale.views.checkout.CheckoutView.as_view(),
+        name='event.checkout'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/$', pretix.presale.views.order.OrderDetails.as_view(),
+        name='event.order'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/cancel$',
+        pretix.presale.views.order.OrderCancel.as_view(),
+        name='event.order.cancel'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/modify$',
+        pretix.presale.views.order.OrderModify.as_view(),
+        name='event.order.modify'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay$', pretix.presale.views.order.OrderPay.as_view(),
+        name='event.order.pay'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay/confirm$',
+        pretix.presale.views.order.OrderPayDo.as_view(),
+        name='event.order.pay.confirm'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/pay/complete$',
+        pretix.presale.views.order.OrderPayComplete.as_view(),
+        name='event.order.pay.complete'),
+    url(r'^order/(?P<order>[^/]+)/(?P<secret>[A-Za-z0-9]+)/download/(?P<output>[^/]+)$',
+        pretix.presale.views.order.OrderDownload.as_view(),
+        name='event.order.download'),
+    url(r'^$', pretix.presale.views.event.EventIndex.as_view(), name='event.index'),
+]
+
+urlpatterns = [
+    url(r'^locale/set$', pretix.presale.views.locale.LocaleSet.as_view(), name='locale.set'),
+    url(r'^(?P<event>[^/]+)/', include(eventurls)),
+    url(r'^(?P<organizer>[^/]+)/(?P<event>[^/]+)/', include(eventurls)),
 ]
diff --git a/src/pretix/presale/views/__init__.py b/src/pretix/presale/views/__init__.py
index a60e3a63c..7ac6cb069 100644
--- a/src/pretix/presale/views/__init__.py
+++ b/src/pretix/presale/views/__init__.py
@@ -2,12 +2,12 @@ from datetime import timedelta
 from itertools import groupby
 
 from django.contrib.auth.views import redirect_to_login
-from django.core.urlresolvers import reverse
 from django.utils.functional import cached_property
 from django.utils.timezone import now
 
 from pretix.base.models import CartPosition
 from pretix.base.signals import register_payment_providers
+from pretix.multidomain.urlreverse import eventreverse
 
 
 def login_required(view_func):
@@ -15,12 +15,7 @@ def login_required(view_func):
         if request.user.is_authenticated():
             return view_func(request, *args, **kwargs)
         path = request.path
-        return redirect_to_login(
-            path, reverse('presale:event.checkout.login', kwargs={
-                'organizer': request.event.organizer.slug,
-                'event': request.event.slug,
-            }), 'next'
-        )
+        return redirect_to_login(path, eventreverse(request.event, 'presale:event.checkout.login'), 'next')
 
     return _wrapped_view
 
diff --git a/src/pretix/presale/views/cart.py b/src/pretix/presale/views/cart.py
index c83505654..e2c0a39b3 100644
--- a/src/pretix/presale/views/cart.py
+++ b/src/pretix/presale/views/cart.py
@@ -1,5 +1,4 @@
 from django.contrib import messages
-from django.core.urlresolvers import reverse
 from django.http import JsonResponse
 from django.shortcuts import redirect
 from django.utils.translation import ugettext as _
@@ -8,6 +7,7 @@ from django.views.generic import View
 from pretix.base.services.cart import (
     CartError, add_items_to_cart, remove_items_from_cart,
 )
+from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.views import EventViewMixin
 from pretix.presale.views.async import AsyncAction
 
@@ -18,10 +18,7 @@ class CartActionMixin:
         if "next" in self.request.GET and '://' not in self.request.GET:
             return self.request.GET.get('next')
         else:
-            return reverse('presale:event.index', kwargs={
-                'event': self.request.event.slug,
-                'organizer': self.request.event.organizer.slug,
-            })
+            return eventreverse(self.request.event, 'presale:event.index')
 
     def get_success_url(self, value=None):
         return self.get_next_url()
diff --git a/src/pretix/presale/views/checkout.py b/src/pretix/presale/views/checkout.py
index a6fd970a9..f85d10beb 100644
--- a/src/pretix/presale/views/checkout.py
+++ b/src/pretix/presale/views/checkout.py
@@ -1,10 +1,10 @@
 from django.contrib import messages
-from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.shortcuts import redirect
 from django.utils.translation import ugettext_lazy as _
 from django.views.generic import View
 
+from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.checkoutflow import get_checkout_flow
 from pretix.presale.views import CartMixin
 
@@ -14,10 +14,7 @@ class CheckoutView(CartMixin, View):
         self.request = request
         if not self.positions and "async_id" not in request.GET:
             messages.error(request, _("Your cart is empty"))
-            return redirect(reverse('presale:event.index', kwargs={
-                'organizer': self.request.event.organizer.slug,
-                'event': self.request.event.slug
-            }))
+            return redirect(eventreverse(self.request.event, 'presale:event.index'))
 
         flow = get_checkout_flow(self.request.event)
         for step in flow:
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index c0147ee39..833a0e6b2 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -14,6 +14,7 @@ from pretix.base.services.tickets import generate
 from pretix.base.signals import (
     register_payment_providers, register_ticket_outputs,
 )
+from pretix.multidomain.urlreverse import eventreverse
 from pretix.presale.views import CartMixin, EventViewMixin
 from pretix.presale.views.questions import QuestionsViewMixin
 
@@ -36,9 +37,7 @@ class OrderDetailMixin:
                 return provider
 
     def get_order_url(self):
-        return reverse('presale:event.order', kwargs={
-            'event': self.request.event.slug,
-            'organizer': self.request.event.organizer.slug,
+        return eventreverse(self.request.event, 'presale:event.order', kwargs={
             'order': self.order.code,
             'secret': self.order.secret
         })
@@ -132,9 +131,7 @@ class OrderPay(EventViewMixin, OrderDetailMixin, TemplateView):
         return self.payment_provider.payment_form_render(self.request)
 
     def get_confirm_url(self):
-        return reverse('presale:event.order.pay.confirm', kwargs={
-            'event': self.request.event.slug,
-            'organizer': self.request.event.organizer.slug,
+        return eventreverse(self.request.event, 'presale:event.order.pay.confirm', kwargs={
             'order': self.order.code,
             'secret': self.order.secret
         })
@@ -169,9 +166,7 @@ class OrderPayDo(EventViewMixin, OrderDetailMixin, TemplateView):
         return ctx
 
     def get_payment_url(self):
-        return reverse('presale:event.order.pay', kwargs={
-            'event': self.request.event.slug,
-            'organizer': self.request.event.organizer.slug,
+        return eventreverse(self.request.event, 'presale:event.order.pay', kwargs={
             'order': self.order.code,
             'secret': self.order.secret
         })
@@ -194,9 +189,7 @@ class OrderPayComplete(EventViewMixin, OrderDetailMixin, View):
         return redirect(resp or self.get_order_url() + '?paid=yes')
 
     def get_payment_url(self):
-        return reverse('presale:event.order.pay', kwargs={
-            'event': self.request.event.slug,
-            'organizer': self.request.event.organizer.slug,
+        return eventreverse(self.request.event, 'presale:event.order.pay', kwargs={
             'order': self.order.code,
             'secret': self.order.secret
         })
diff --git a/src/pretix/settings.py b/src/pretix/settings.py
index 2794c9aae..25193ca07 100644
--- a/src/pretix/settings.py
+++ b/src/pretix/settings.py
@@ -65,7 +65,7 @@ PRETIX_PLUGINS_DEFAULT = config.get('pretix', 'plugins_default',
 
 DEFAULT_CURRENCY = config.get('pretix', 'currency', fallback='EUR')
 
-ALLOWED_HOSTS = config.get('django', 'hosts', fallback='localhost').split(',')
+ALLOWED_HOSTS = ['*']
 
 LANGUAGE_CODE = config.get('locale', 'default', fallback='en')
 TIME_ZONE = config.get('locale', 'timezone', fallback='UTC')
@@ -79,11 +79,6 @@ EMAIL_HOST_PASSWORD = config.get('mail', 'password', fallback='')
 
 ADMINS = [('Admin', n) for n in config.get('mail', 'admins', fallback='').split(",") if n]
 
-SESSION_COOKIE_SECURE = SESSION_COOKIE_HTTPONLY = config.getboolean(
-    'pretix', 'securecookie', fallback=False)
-LANGUAGE_COOKIE_DOMAIN = SESSION_COOKIE_DOMAIN = CSRF_COOKIE_DOMAIN = config.get(
-    'pretix', 'cookiedomain', fallback=None)
-
 CACHES = {
     'default': {
         'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
@@ -98,6 +93,8 @@ if HAS_MEMCACHED:
         'LOCATION': config.get('memcached', 'location'),
     }
 
+SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"
+
 HAS_REDIS = config.has_option('redis', 'location')
 if HAS_REDIS:
     CACHES['redis'] = {
@@ -126,6 +123,7 @@ STATIC_ROOT = '_static'
 SESSION_COOKIE_NAME = 'pretix_session'
 LANGUAGE_COOKIE_NAME = 'pretix_language'
 CSRF_COOKIE_NAME = 'pretix_csrftoken'
+SESSION_COOKIE_HTTPONLY = True
 
 INSTALLED_APPS = (
     'django.contrib.auth',
@@ -136,6 +134,7 @@ INSTALLED_APPS = (
     'pretix.base',
     'pretix.control',
     'pretix.presale',
+    'pretix.multidomain',
     'compressor',
     'bootstrap3',
     'debug_toolbar.apps.DebugToolbarConfig',
@@ -153,9 +152,10 @@ INSTALLED_APPS = (
 )
 
 MIDDLEWARE_CLASSES = (
-    'django.contrib.sessions.middleware.SessionMiddleware',
+    'pretix.multidomain.middlewares.MultiDomainMiddleware',
+    'pretix.multidomain.middlewares.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
-    'django.middleware.csrf.CsrfViewMiddleware',
+    'pretix.multidomain.middlewares.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'debug_toolbar.middleware.DebugToolbarMiddleware',
@@ -272,6 +272,7 @@ MESSAGE_TAGS = {
     messages.WARNING: 'alert-warning',
     messages.SUCCESS: 'alert-success',
 }
+MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage'
 
 THUMBNAIL_ALIASES = {
     '': {
diff --git a/src/pretix/urls.py b/src/pretix/urls.py
index 74a803617..19fc87aea 100644
--- a/src/pretix/urls.py
+++ b/src/pretix/urls.py
@@ -31,6 +31,7 @@ for app in apps.get_app_configs():
             pluginpatterns.append(
                 url(r'', include(urlmod, namespace=app.label))
             )
+
 urlpatterns.append(
     url(r'', include(pluginpatterns, namespace='plugins'))
 )
diff --git a/src/tests/__init__.py b/src/tests/__init__.py
index e69de29bb..751676529 100644
--- a/src/tests/__init__.py
+++ b/src/tests/__init__.py
@@ -0,0 +1,35 @@
+from django.db import DEFAULT_DB_ALIAS, connections
+from django.test.utils import CaptureQueriesContext
+
+
+# Inspired by /django/test/testcases.py
+# but copied over to work without the unit test module
+
+class _AssertNumQueriesContext(CaptureQueriesContext):
+    def __init__(self, num, connection):
+        self.num = num
+        super(_AssertNumQueriesContext, self).__init__(connection)
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        super(_AssertNumQueriesContext, self).__exit__(exc_type, exc_value, traceback)
+        if exc_type is not None:
+            return
+        executed = len(self)
+        assert executed == self.num, "%d queries executed, %d expected\nCaptured queries were:\n%s" % (
+            executed, self.num,
+            '\n'.join(
+                query['sql'] for query in self.captured_queries
+            )
+        )
+
+
+def assert_num_queries(num, func=None, *args, **kwargs):
+    using = kwargs.pop("using", DEFAULT_DB_ALIAS)
+    conn = connections[using]
+
+    context = _AssertNumQueriesContext(num, conn)
+    if func is None:
+        return context
+
+    with context:
+        func(*args, **kwargs)
diff --git a/src/tests/multidomain/__init__.py b/src/tests/multidomain/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/tests/multidomain/test_middlewares.py b/src/tests/multidomain/test_middlewares.py
new file mode 100644
index 000000000..eca527faf
--- /dev/null
+++ b/src/tests/multidomain/test_middlewares.py
@@ -0,0 +1,88 @@
+import pytest
+from django.conf import settings
+from django.template import Context, Template
+from django.utils.timezone import now
+
+from pretix.base.models import Event, Organizer
+from pretix.multidomain.models import KnownDomain
+
+
+@pytest.fixture
+def env():
+    o = Organizer.objects.create(name='MRMCD', slug='mrmcd')
+    event = Event.objects.create(
+        organizer=o, name='MRMCD2015', slug='2015',
+        date_from=now()
+    )
+    settings.SITE_URL = 'http://example.com'
+    return o, event
+
+
+@pytest.mark.django_db
+def test_control_only_on_main_domain(env, client):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/control/login', HTTP_HOST='foobar')
+    assert r.status_code == 302
+    assert r['Location'] == 'http://example.com/control/login'
+
+
+@pytest.mark.django_db
+def test_unknown_domain(env, client):
+    r = client.get('/control/login', HTTP_HOST='foobar')
+    assert r.status_code == 400
+
+
+@pytest.mark.django_db
+def test_event_on_custom_domain(env, client):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/2015/', HTTP_HOST='foobar')
+    assert r.status_code == 200
+
+
+@pytest.mark.django_db
+def test_event_with_custom_domain_on_main_domain(env, client):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/mrmcd/2015/', HTTP_HOST='example.com')
+    assert r.status_code == 302
+    assert r['Location'] == 'http://foobar/2015/'
+
+
+@pytest.mark.django_db
+def test_event_on_custom_domain_only_with_wrong_organizer(env, client):
+    organizer2 = Organizer.objects.create(name='Dummy', slug='dummy')
+    Event.objects.create(
+        organizer=organizer2, name='D1234', slug='1234',
+        date_from=now()
+    )
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/dummy/1234/', HTTP_HOST='foobar')
+    assert r.status_code == 404
+
+
+@pytest.mark.django_db
+def test_unknown_event_on_custom_domain(env, client):
+    organizer2 = Organizer.objects.create(name='Dummy', slug='dummy')
+    Event.objects.create(
+        organizer=organizer2, name='D1234', slug='1234',
+        date_from=now()
+    )
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/1234/', HTTP_HOST='foobar')
+    assert r.status_code == 404
+
+
+@pytest.mark.django_db
+def test_cookie_domain_on_custom_domain(env, client):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    r = client.get('/2015/', HTTP_HOST='foobar')
+    assert r.status_code == 200
+    assert r.client.cookies['pretix_csrftoken']['domain'] == 'foobar'
+    assert r.client.cookies['pretix_session']['domain'] == 'foobar'
+
+
+@pytest.mark.django_db
+def test_cookie_domain_on_main_domain(env, client):
+    r = client.get('/mrmcd/2015/', HTTP_HOST='example.com')
+    assert r.status_code == 200
+    assert r.client.cookies['pretix_csrftoken']['domain'] == 'example.com'
+    assert r.client.cookies['pretix_session']['domain'] == 'example.com'
diff --git a/src/tests/multidomain/test_templatetag.py b/src/tests/multidomain/test_templatetag.py
new file mode 100644
index 000000000..a0e7653c3
--- /dev/null
+++ b/src/tests/multidomain/test_templatetag.py
@@ -0,0 +1,56 @@
+import pytest
+from django.conf import settings
+from django.template import Context, Template
+from django.utils.timezone import now
+
+from pretix.base.models import Event, Organizer
+from pretix.multidomain.models import KnownDomain
+
+
+@pytest.fixture
+def env():
+    o = Organizer.objects.create(name='MRMCD', slug='mrmcd')
+    event = Event.objects.create(
+        organizer=o, name='MRMCD2015', slug='2015',
+        date_from=now()
+    )
+    settings.SITE_URL = 'http://example.com'
+    return o, event
+
+
+TEMPLATE_FRONT_PAGE = Template("{% load eventurl %} {% eventurl event 'presale:event.index' %}")
+TEMPLATE_KWARGS = Template("{% load eventurl %} {% eventurl event 'presale:event.checkout' step='payment' %}")
+
+
+@pytest.mark.django_db
+def test_event_main_domain_front_page(env):
+    rendered = TEMPLATE_FRONT_PAGE.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == '/mrmcd/2015/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_front_page(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    rendered = TEMPLATE_FRONT_PAGE.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://foobar/2015/'
+
+
+@pytest.mark.django_db
+def test_event_main_domain_kwargs(env):
+    rendered = TEMPLATE_KWARGS.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == '/mrmcd/2015/checkout/payment/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_kwargs(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    rendered = TEMPLATE_KWARGS.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://foobar/2015/checkout/payment/'
diff --git a/src/tests/multidomain/test_urlreverse.py b/src/tests/multidomain/test_urlreverse.py
new file mode 100644
index 000000000..39c4c2735
--- /dev/null
+++ b/src/tests/multidomain/test_urlreverse.py
@@ -0,0 +1,96 @@
+import pytest
+from django.conf import settings
+from django.utils.timezone import now
+from tests import assert_num_queries
+
+from pretix.base.models import Event, Organizer
+from pretix.multidomain.models import KnownDomain
+from pretix.multidomain.urlreverse import build_absolute_uri, eventreverse
+
+
+@pytest.fixture
+def env():
+    o = Organizer.objects.create(name='MRMCD', slug='mrmcd')
+    event = Event.objects.create(
+        organizer=o, name='MRMCD2015', slug='2015',
+        date_from=now()
+    )
+    settings.SITE_URL = 'http://example.com'
+    return o, event
+
+
+@pytest.mark.django_db
+def test_event_main_domain_front_page(env):
+    assert eventreverse(env[1], 'presale:event.index') == '/mrmcd/2015/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_kwargs(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    assert eventreverse(env[1], 'presale:event.checkout', {'step': 'payment'}) == 'http://foobar/2015/checkout/payment/'
+
+
+@pytest.mark.django_db
+def test_event_main_domain_kwargs(env):
+    assert eventreverse(env[1], 'presale:event.checkout', {'step': 'payment'}) == '/mrmcd/2015/checkout/payment/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_front_page(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    assert eventreverse(env[1], 'presale:event.index') == 'http://foobar/2015/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_keep_port(env):
+    settings.SITE_URL = 'http://example.com:8081'
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    assert eventreverse(env[1], 'presale:event.index') == 'http://foobar:8081/2015/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_keep_scheme(env):
+    settings.SITE_URL = 'https://example.com'
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    assert eventreverse(env[1], 'presale:event.index') == 'https://foobar/2015/'
+
+
+@pytest.mark.django_db
+def test_event_main_domain_cache(env):
+    env[0].get_cache().clear()
+    with assert_num_queries(1):
+        eventreverse(env[1], 'presale:event.index')
+    with assert_num_queries(0):
+        eventreverse(env[1], 'presale:event.index')
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_cache(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    env[0].get_cache().clear()
+    with assert_num_queries(1):
+        eventreverse(env[1], 'presale:event.index')
+    with assert_num_queries(0):
+        eventreverse(env[1], 'presale:event.index')
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_cache_clear(env):
+    kd = KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    env[0].get_cache().clear()
+    with assert_num_queries(1):
+        eventreverse(env[1], 'presale:event.index')
+    kd.delete()
+    with assert_num_queries(1):
+        eventreverse(env[1], 'presale:event.index')
+
+
+@pytest.mark.django_db
+def test_event_main_domain_absolute(env):
+    assert build_absolute_uri(env[1], 'presale:event.index') == 'http://example.com/mrmcd/2015/'
+
+
+@pytest.mark.django_db
+def test_event_custom_domain_absolute(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    assert build_absolute_uri(env[1], 'presale:event.index') == 'http://foobar/2015/'
diff --git a/src/tests/presale/test_checkout.py b/src/tests/presale/test_checkout.py
index 27b9b25f0..4ef632cd0 100644
--- a/src/tests/presale/test_checkout.py
+++ b/src/tests/presale/test_checkout.py
@@ -34,7 +34,7 @@ class CheckoutTestCase(TestCase):
         self._set_session('email', 'admin@localhost')
 
     def test_empty_cart(self):
-        response = self.client.get('/%s/%s/checkout/' % (self.orga.slug, self.event.slug), follow=True)
+        response = self.client.get('/%s/%s/checkout/start' % (self.orga.slug, self.event.slug), follow=True)
         self.assertRedirects(response, '/%s/%s/' % (self.orga.slug, self.event.slug),
                              target_status_code=200)