private void CleanUp(CongregatioServiceClient client, Event @event, User attendee)
 {
     var user = @event.User;
     @event.Attendees = new List<User>();
     client.UpdateEvent(@event);
     attendee.AttendedEvents = new List<Event>();
     client.UpdateUser(attendee);
     @event = client.GetEventByIdLong(@event.Id);
     attendee = client.FindUserById(attendee.UserId);
     client.RemoveUser(attendee);
     client.RemoveEvent(@event);
     user = client.FindUserById(user.UserId);
     client.RemoveUser(user);
 }