FIX: Number of accepted events were not displayed.

dav_events/models/event.py

@@ -433,7 +433,7 @@ class Event(models.Model):
         return n
 
     def get_number(self):
-        if self.accepted and self.number:
+        if self.is_flagged('accepted') and self.number:
             return self.number
         else:
             return '%s**/%d' % (self.sport, self.first_day.year % 100)