docs: def get_fieldsets(self, *args, **kwargs):
          """Re-order fields"""
          result = super(EventAdmin, self).get_fieldsets(*args, **kwargs)
          result = list(result)
          fields = list(result[0][1]['fields'])
          for name in ('content', 'start', 'end', 'repeat', 'repeat_until', \
              'external_link', 'calendars'):
              fields.remove(name)
              fields.append(name)
          result[0][1]['fields'] = tuple(fields)
          return tuple(result)