Locally adds a new partecipant to an Event obj.
The attendee's response comment.
Sets whether this is an optional attendee.
Sets whether the attendee is the organizer of the event.
Sets whether the attendee is a resource. Can only be set when the attendee is added to the event for the first time.
The event where to add the new partecipant.
The attendee's email address. It must be a valid email address as per RFC5322.
The attendee's name.