code: def event_update_list(request, slug):
      
      event = get_object_or_404(Event, slug=slug)
      updates = Update.objects.filter(event__slug=slug)
      if event.recently_ended():
          # if the event is over, use chronological order
          updates = updates.order_by('id')
      else:
          # if not, use reverse chronological
          updates = updates.order_by('-id')
      return render(request, 'happenings/updates/update_list.html', {
          'event': event,
          'object_list': updates,
      })
docs: Returns a list view of updates for a given event.
      If the event is over, it will be in chronological order.
      If the event is upcoming or still going,
      it will be in reverse chronological order.