* fixed 404 errors in the gallery.

src/events/mixins.py

@@ -1,6 +1,8 @@
 """Mixins for Events."""
+from django.db.models import Q
 from django.http import Http404
 from django.shortcuts import get_object_or_404
+
 from . import models
 
 
@@ -54,6 +56,20 @@ class EventDetailMixin(object):
             self.event = get_object_or_404(models.Event, pk=self.kwargs['pk'])
             queryset = self.model.objects.all()
         else:
-            self.event = get_object_or_404(models.Event, pk=self.kwargs['event'])
+            self.event = get_object_or_404(models.Event,
+                                           pk=self.kwargs['event'])
             queryset = self.model.objects.filter(event=self.event)
         return queryset.prefetch_related()
+
+
+class EventPhotoMixin(EventDetailMixin):
+
+    def get_queryset(self):
+        try:
+            self.event = models.Event.objects.get(id=self.kwargs['event'])
+            return models.Photo.objects.filter(
+                Q(event=self.event) |
+                Q(event__event_series=self.event)
+            )
+        except models.Event.DoesNotExist:
+            raise Http404(_('Event does not exist'))