Merge branch 'master' into checkpoint

aleksis/apps/paweljong/models.py

@@ -172,7 +172,7 @@ class Event(ExtensibleModel):
             if request.user.person in self.linked_group.members.all():
                 return False
 
-            if EventRegistration.objects.filter(person=request.user.person).exists():
+            if self.registrations.filter(person=request.user.person).exists():
                 return False
 
             if (