public void When(PersonUnlinkValidated e)
{
}
/// <summary>
/// This is called after unlink is validated at happening aggregate.
/// </summary>
/// <param name="e"></param>
public Task When(PersonUnlinkValidated e) => this.personRepository.Execute(
e.PersonId,
person => person.UnlinkFromHappening(e.PersonId, e.HappeningId));