'Invite will be saved to database with proper Event id and User id
:param user_id: Invite belongs to User by user id
:param event_id: Invite belongs to Event by event id'

@staticmethod
def add_invite_to_event(user_id, event_id):

    new_invite = Invite(user_id=user_id, event_id=event_id)
    hash = random.getrandbits(128)
    new_invite.hash = ('%032x' % hash)
    save_to_db(new_invite, 'Invite    saved')
    record_activity('invite_user', event_id=event_id, user_id=user_id)
