Add filter to permissions

event/signals.py

@@ -17,7 +17,9 @@ def create_groups_for_event(sender, **kwargs):
             event=event
         )
 
-        for perm in Permission.objects.filter(codename__contains="event_"):
+        for perm in Permission.objects.filter(
+                content_type=ContentType.objects.get_for_model(Event),
+                codename__contains="event_"):
             assign_perm(perm.codename, orgas, event)
 
         GEGroup.objects.create(