Add improved UI if no event can be created

src/pretix/control/templates/pretixcontrol/events/create_base.html

@@ -6,6 +6,7 @@
 	<h1>{% trans "Create a new event" %} <small>{% blocktrans trimmed with step=wizard.steps.step1 %}
         Step {{ step }}
     {% endblocktrans %}</small></h1>
+    {% if has_organizer %}
         <form action="" method="post" class="form-horizontal">
             {% csrf_token %}
             {{ wizard.management_form }}
@@ -24,4 +25,14 @@
                 </button>
             </div>
         </form>
+    {% else %}
+        <div class="alert alert-danger">
+            {% trans "Every event needs to be created as part of an organizer account. Currently, you do not have access to any organizer accounts." %}
+        </div>
+        {% if request.user.is_superuser %}
+            <a href="{% url "control:organizers.add" %}" class="btn btn-default">
+                {% trans "Create a new organizer" %}
+            </a>
+        {% endif %}
+    {% endif %}
 {% endblock %}

src/pretix/control/views/main.py

@@ -7,7 +7,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.views.generic import ListView
 from formtools.wizard.views import SessionWizardView
 
-from pretix.base.models import Event, EventPermission
+from pretix.base.models import Event, EventPermission, OrganizerPermission
 from pretix.control.forms.event import (
     EventWizardBasicsForm, EventWizardCopyForm, EventWizardFoundationForm,
 )
@@ -48,6 +48,12 @@ class EventWizard(SessionWizardView):
         'copy': condition_copy
     }
 
+    def get_context_data(self, form, **kwargs):
+        ctx = super().get_context_data(form, **kwargs)
+        ctx['has_organizer'] = OrganizerPermission.objects.filter(user=self.request.user,
+                                                                  can_create_events=True).exists()
+        return ctx
+
     def get_form_kwargs(self, step=None):
         kwargs = {
             'user': self.request.user