diff --git a/src/pretix/base/views/tasks.py b/src/pretix/base/views/tasks.py
index c34d2c05d0..fa26e3a870 100644
--- a/src/pretix/base/views/tasks.py
+++ b/src/pretix/base/views/tasks.py
@@ -27,7 +27,7 @@ from celery.result import AsyncResult
 from django.conf import settings
 from django.contrib import messages
 from django.core.exceptions import ValidationError
-from django.http import JsonResponse
+from django.http import JsonResponse, QueryDict
 from django.shortcuts import redirect, render
 from django.test import RequestFactory
 from django.utils import timezone, translation
@@ -206,22 +206,30 @@ class AsyncFormView(AsyncMixin, FormView):
     def __init_subclass__(cls):
         def async_execute(self, *, request_path, form_kwargs, locale, tz, organizer=None, event=None, user=None):
             view_instance = cls()
-            view_instance.request = RequestFactory().post(request_path)
-            if organizer:
+            d = QueryDict(mutable=True)
+            d.update(form_kwargs['data'])
+            req = RequestFactory().post(
+                request_path,
+                data=d.urlencode(),
+                content_type='application/x-www-form-urlencoded'
+            )
+            view_instance.request = req
+            if event:
                 view_instance.request.event = event
-            if organizer:
+                view_instance.request.organizer = event.organizer
+            elif organizer:
                 view_instance.request.organizer = organizer
             if user:
                 view_instance.request.user = User.objects.get(pk=user)
 
-            form_class = view_instance.get_form_class()
-            if form_kwargs.get('instance'):
-                cls.model.objects.get(pk=form_kwargs['instance'])
-
-            form_kwargs = view_instance.get_async_form_kwargs(form_kwargs, organizer, event)
-
-            form = form_class(**form_kwargs)
             with translation.override(locale), timezone.override(pytz.timezone(tz)):
+                form_class = view_instance.get_form_class()
+                if form_kwargs.get('instance'):
+                    cls.model.objects.get(pk=form_kwargs['instance'])
+
+                form_kwargs = view_instance.get_async_form_kwargs(form_kwargs, organizer, event)
+                form = form_class(**form_kwargs)
+                form.is_valid()
                 return view_instance.async_form_valid(self, form)
 
         cls.async_execute = app.task(
@@ -254,6 +262,8 @@ class AsyncFormView(AsyncMixin, FormView):
             else:
                 form_kwargs['instance'] = None
         form_kwargs.setdefault('data', {})
+        form_kwargs['initial'] = {}
+        form_kwargs.pop('event', None)
         kwargs = {
             'request_path': self.request.path,
             'form_kwargs': form_kwargs,
diff --git a/src/pretix/control/templates/pretixcontrol/subevents/bulk.html b/src/pretix/control/templates/pretixcontrol/subevents/bulk.html
index 98f2e6dbf6..1b581d1d8d 100644
--- a/src/pretix/control/templates/pretixcontrol/subevents/bulk.html
+++ b/src/pretix/control/templates/pretixcontrol/subevents/bulk.html
@@ -8,7 +8,7 @@
 {% block title %}{% trans "Date" context "subevent" %}{% endblock %}
 {% block content %}
     <h1>{% trans "Create multiple dates" context "subevent" %}</h1>
-    <form action="" method="post" class="form-horizontal" id="subevent-bulk-create-form">
+    <form action="" method="post" class="form-horizontal" id="subevent-bulk-create-form" data-asynctask>
         {% csrf_token %}
         {% bootstrap_form_errors form %}
         {% for f in itemvar_forms %}
diff --git a/src/pretix/control/views/subevents.py b/src/pretix/control/views/subevents.py
index 5264a88e9f..aa49b45353 100644
--- a/src/pretix/control/views/subevents.py
+++ b/src/pretix/control/views/subevents.py
@@ -38,6 +38,7 @@ from datetime import datetime, time, timedelta
 
 from dateutil.rrule import DAILY, MONTHLY, WEEKLY, YEARLY, rrule, rruleset
 from django.contrib import messages
+from django.core.exceptions import ValidationError
 from django.core.files import File
 from django.db import connections, transaction
 from django.db.models import Count, F, Prefetch
@@ -64,6 +65,7 @@ from pretix.base.models.items import (
 from pretix.base.reldate import RelativeDate, RelativeDateWrapper
 from pretix.base.services import tickets
 from pretix.base.services.quotas import QuotaAvailability
+from pretix.base.views.tasks import AsyncFormView
 from pretix.control.forms.checkin import SimpleCheckinListForm
 from pretix.control.forms.filter import SubEventFilterForm
 from pretix.control.forms.item import QuotaForm
@@ -659,7 +661,7 @@ class SubEventBulkAction(SubEventQueryMixin, EventPermissionRequiredMixin, View)
         })
 
 
-class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, CreateView):
+class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, AsyncFormView):
     model = SubEvent
     template_name = 'pretixcontrol/subevents/bulk.html'
     permission = 'can_change_settings'
@@ -668,10 +670,20 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
     itemformclass = BulkSubEventItemForm
     itemvarformclass = BulkSubEventItemVariationForm
 
+    def dispatch(self, request, *args, **kwargs):
+        self.object = SubEvent(event=self.request.event)
+        return super().dispatch(request, *args, **kwargs)
+
     def is_valid(self, form):
         return self.rrule_formset.is_valid() and self.time_formset.is_valid() and super().is_valid(form)
 
-    def get_success_url(self) -> str:
+    def get_success_url(self, value) -> str:
+        return reverse('control:event.subevents', kwargs={
+            'organizer': self.request.event.organizer.slug,
+            'event': self.request.event.slug,
+        })
+
+    def get_error_url(self) -> str:
         return reverse('control:event.subevents', kwargs={
             'organizer': self.request.event.organizer.slug,
             'event': self.request.event.slug,
@@ -755,6 +767,11 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
         kwargs['initial'] = initial
         return kwargs
 
+    def get_async_form_kwargs(self, form_kwargs, organizer=None, event=None):
+        form_kwargs['event'] = event
+        form_kwargs['instance'] = SubEvent(event=event)
+        return form_kwargs
+
     def get_times(self):
         times = []
         for f in self.time_formset:
@@ -808,7 +825,31 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
         return s
 
     @transaction.atomic
-    def form_valid(self, form):
+    def async_form_valid(self, task, form):
+        self.object = SubEvent(event=self.request.event)
+        if not self.is_valid(form):
+            print([
+                self.rrule_formset.is_valid(),
+                self.time_formset.is_valid(),
+                form.is_valid(),
+                [f.is_valid() for f in self.itemvar_forms],
+                self.formset.is_valid(),
+                [f.is_valid() for f in self.meta_forms],
+                self.cl_formset.is_valid(),
+                [f.is_valid() for f in self.plugin_forms]
+            ])
+            print(form.errors)
+            raise ValidationError('Invalid submission')
+
+        def set_progress(percent):
+            if not task.request.called_directly:
+                task.update_state(
+                    state='PROGRESS',
+                    meta={'value': percent}
+                )
+
+        set_progress(0)
+
         tz = self.request.event.timezone
         subevents = []
         for rdate in self.get_rrule_set():
@@ -840,9 +881,15 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
                     if form.cleaned_data.get('rel_presale_end')
                     else None
                 )
-                se.save(clear_cache=False)
                 subevents.append(se)
 
+        for i, se in enumerate(subevents):
+            se.save(clear_cache=False)
+            if i % 100 == 0:
+                set_progress(10 * i / len(subevents))
+
+        set_progress(10)
+
         data = dict(form.cleaned_data)
         for f in self.plugin_forms:
             data.update({
@@ -865,10 +912,12 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
                     to_save.append(i)
         SubEventMetaValue.objects.bulk_create(to_save)
 
+        set_progress(20)
+
         to_save_items = []
         to_save_variations = []
         for f in self.itemvar_forms:
-            for se in subevents:
+            for i, se in enumerate(subevents):
                 i = copy.copy(f.instance)
                 i.pk = None
                 i.subevent = se
@@ -888,17 +937,20 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
                     to_save_items.append(i)
                 else:
                     to_save_variations.append(i)
+
         SubEventItem.objects.bulk_create(to_save_items)
+        set_progress(30)
         SubEventItemVariation.objects.bulk_create(to_save_variations)
+        set_progress(40)
 
         to_save_items = []
         to_save_variations = []
-        for f in self.formset.forms:
+        for k, f in enumerate(self.formset.forms):
             if self.formset._should_delete_form(f) or not f.has_changed():
                 continue
 
             change_data = {k: f.cleaned_data.get(k) for k in f.changed_data}
-            for se in subevents:
+            for j, se in enumerate(subevents):
                 i = copy.copy(f.instance)
                 i.pk = None
                 i.subevent = se
@@ -923,8 +975,13 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
                 log_entries.append(
                     se.log_action('pretix.subevent.quota.added', user=self.request.user, data=change_data, save=False)
                 )
+
+                if j % 100 == 0:
+                    set_progress(50 + 10 * (j + k * len(subevents)) / (len(self.formset.forms) + len(subevents)))
         Quota.items.through.objects.bulk_create(to_save_items)
+        set_progress(60)
         Quota.variations.through.objects.bulk_create(to_save_variations)
+        set_progress(70)
 
         to_save_products = []
         for f in self.cl_formset.forms:
@@ -945,12 +1002,14 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
                                  save=False)
                 )
         CheckinList.limit_products.through.objects.bulk_create(to_save_products)
+        set_progress(80)
 
         for f in self.plugin_forms:
             f.is_valid()
             for se in subevents:
                 f.subevent = se
                 f.save()
+        set_progress(90)
 
         if connections['default'].features.can_return_rows_from_bulk_insert:
             LogEntry.objects.bulk_create(log_entries)
@@ -961,11 +1020,10 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Crea
             LogEntry.bulk_postprocess(log_entries)
 
         self.request.event.cache.clear()
-        messages.success(self.request, pgettext_lazy('subevent', '{} new dates have been created.').format(len(subevents)))
-        return redirect(reverse('control:event.subevents', kwargs={
-            'organizer': self.request.event.organizer.slug,
-            'event': self.request.event.slug,
-        }))
+        return len(subevents)
+
+    def get_success_message(self, value):
+        return pgettext_lazy('subevent', '{} new dates have been created.').format(value)
 
     def post(self, request, *args, **kwargs):
         form = self.get_form()
diff --git a/src/pretix/static/pretixbase/js/asynctask.js b/src/pretix/static/pretixbase/js/asynctask.js
index 34c630f083..a162de69e4 100644
--- a/src/pretix/static/pretixbase/js/asynctask.js
+++ b/src/pretix/static/pretixbase/js/asynctask.js
@@ -72,6 +72,8 @@ function async_task_check_error(jqXHR, textStatus, errorThrown) {
         ));
         form_handlers($("body"));
         setup_collapsible_details($("body"));
+        window.setTimeout(function () { $(window).scrollTop(0) }, 200)
+        $(document).trigger("pretix:bind-forms");
     } else if (c.length > 0) {
         // This is some kind of 500/404/403 page, show it in an overlay
         $("body").data('ajaxing', false);
@@ -152,6 +154,8 @@ function async_task_error(jqXHR, textStatus, errorThrown) {
                 $("#page-wrapper").html(respdom.find("#page-wrapper").html());
                 form_handlers($("#page-wrapper"));
                 setup_collapsible_details($("#page-wrapper"));
+                $(document).trigger("pretix:bind-forms");
+                window.setTimeout(function () { $(window).scrollTop(0) }, 200)
             } else {
                 $("body").html(jqXHR.responseText.substring(
                     jqXHR.responseText.indexOf("<body"),
@@ -159,6 +163,8 @@ function async_task_error(jqXHR, textStatus, errorThrown) {
                 ));
                 form_handlers($("body"));
                 setup_collapsible_details($("body"));
+                $(document).trigger("pretix:bind-forms");
+                window.setTimeout(function () { $(window).scrollTop(0) }, 200)
             }
 
         } else if (c.length > 0) {
diff --git a/src/pretix/static/pretixcontrol/js/ui/geo.js b/src/pretix/static/pretixcontrol/js/ui/geo.js
index 158eb027c0..bdc6446ee2 100644
--- a/src/pretix/static/pretixcontrol/js/ui/geo.js
+++ b/src/pretix/static/pretixcontrol/js/ui/geo.js
@@ -1,6 +1,6 @@
 /*globals $*/
 
-$(function () {
+$(document).on("pretix:bind-forms", function () {
     function cleanup(l) {
         return $.trim(l.replace(/\n/g, ", "));
     }
diff --git a/src/pretix/static/pretixcontrol/js/ui/main.js b/src/pretix/static/pretixcontrol/js/ui/main.js
index c0a7048985..e78f8c06d8 100644
--- a/src/pretix/static/pretixcontrol/js/ui/main.js
+++ b/src/pretix/static/pretixcontrol/js/ui/main.js
@@ -72,6 +72,36 @@ $(document).ajaxError(function (event, jqXHR, settings, thrownError) {
 });
 
 var form_handlers = function (el) {
+    el.find("[data-formset]").formset(
+        {
+            animateForms: true,
+            reorderMode: 'animate'
+        }
+    );
+    el.find("[data-formset]").on("formAdded", "div", function (event) {
+        form_handlers($(event.target));
+    });
+
+    // Vouchers
+    el.find("#voucher-bulk-codes-generate").click(function () {
+        var num = $("#voucher-bulk-codes-num").val();
+        var prefix = $('#voucher-bulk-codes-prefix').val();
+        if (num != "") {
+            var url = $(this).attr("data-rng-url");
+            $("#id_codes").html("Generating...");
+            $(".form-group:has(#voucher-bulk-codes-num)").removeClass("has-error");
+            $.getJSON(url + '?num=' + num + '&prefix=' + escape(prefix), function (data) {
+                $("#id_codes").val(data.codes.join("\n"));
+            });
+        } else {
+            $(".form-group:has(#voucher-bulk-codes-num)").addClass("has-error");
+            $("#voucher-bulk-codes-num").focus();
+            setTimeout(function () {
+                $(".form-group:has(#voucher-bulk-codes-num)").removeClass("has-error");
+            }, 3000);
+        }
+    });
+
     el.find(".datetimepicker").each(function () {
         $(this).datetimepicker({
             format: $("body").attr("data-datetimeformat"),
@@ -602,15 +632,6 @@ $(function () {
     $("body").removeClass("nojs");
     lightbox.init();
 
-    $("[data-formset]").formset(
-        {
-            animateForms: true,
-            reorderMode: 'animate'
-        }
-    );
-    $("[data-formset]").on("formAdded", "div", function (event) {
-        form_handlers($(event.target));
-    });
     $(document).on("click", ".variations .variations-select-all", function (e) {
         $(this).parent().parent().find("input[type=checkbox]").prop("checked", true).change();
         e.stopPropagation();
@@ -675,27 +696,8 @@ $(function () {
         });
     });
 
-    // Vouchers
-    $("#voucher-bulk-codes-generate").click(function () {
-        var num = $("#voucher-bulk-codes-num").val();
-        var prefix = $('#voucher-bulk-codes-prefix').val();
-        if (num != "") {
-            var url = $(this).attr("data-rng-url");
-            $("#id_codes").html("Generating...");
-            $(".form-group:has(#voucher-bulk-codes-num)").removeClass("has-error");
-            $.getJSON(url + '?num=' + num + '&prefix=' + escape(prefix), function (data) {
-                $("#id_codes").val(data.codes.join("\n"));
-            });
-        } else {
-            $(".form-group:has(#voucher-bulk-codes-num)").addClass("has-error");
-            $("#voucher-bulk-codes-num").focus();
-            setTimeout(function () {
-                $(".form-group:has(#voucher-bulk-codes-num)").removeClass("has-error");
-            }, 3000);
-        }
-    });
-
     form_handlers($("body"));
+    $(document).trigger("pretix:bind-forms");
 
     $(".qrcode-canvas").each(function () {
         $(this).qrcode(
diff --git a/src/pretix/static/pretixcontrol/js/ui/subevent.js b/src/pretix/static/pretixcontrol/js/ui/subevent.js
index b35df37be3..85e4a8ca8b 100644
--- a/src/pretix/static/pretixcontrol/js/ui/subevent.js
+++ b/src/pretix/static/pretixcontrol/js/ui/subevent.js
@@ -1,6 +1,6 @@
 /*globals $, Morris, gettext, RRule, RRuleSet*/
 
-$(function () {
+$(document).on("pretix:bind-forms", function () {
     if (!$("div[data-formset-prefix=checkinlist_set]").length) {
         return;
     }