def post(self):
event = Event(parent=self.get_group_key())
event.date = datetime.strptime(self.request.get('event_date'), "%d %b %Y")
event.title = self.request.get('event_title')
event.description = self.request.get('event_description')
event.capacity = int(self.request.get('event_capacity'))
event.registration_window = int(self.request.get('event_registration_window'))
event_image = self.request.get('event_image')
event.image = event_image
presentations = self.request.get_all('event_presentations')
event_key = event.put()
for p in presentations:
presentation_key = ndb.Key(urlsafe=p)
presentation = presentation_key.get()
presentation.event_key = event_key
presentation.put()
self.redirect('/events')
