public void Modify(GigFormViewModel gigViewModel)
{
var notification = Notification.GigUpdatedNotification(this, this.DateTime, this.Venue);
this.GenreId = gigViewModel.Genre;
this.Venue = gigViewModel.Venue;
this.DateTime = gigViewModel.GetDateTime();
foreach (var attendee in this.Attendances.Select(a => a.Attendee))
{
attendee.Notify(notification);
}
}