public void When(AttendeeScannedAtFinishCheckpoint e) { }
public void When(AttendeeScannedAtFinishCheckpoint e) => PublishToClients(e);
public Task When(AttendeeScannedAtFinishCheckpoint e) => this.repository.Execute(e.HappeningId, h => h.AttendeeCompleted(e.HappeningId, e.PersonId));