code: def forwards(apps, schema_editor):
      
      Event = apps.get_model('spectator_events', 'Event')
  
      for ev in Event.objects.filter(kind='movie'):
          ev.kind = 'cinema'
          ev.save()
  
      for ev in Event.objects.filter(kind='play'):
          ev.kind = 'theatre'
          ev.save()
docs: Change Events with kind 'movie' to 'cinema'
      and Events with kind 'play' to 'theatre'.
  
      Purely for more consistency.