public ActionResult GuestRespond (string rsvpID)
        {
            List<Guests> guestList = DAL.GetRSVPByID(rsvpID);

            if (guestList.FirstOrDefault().hasRSVPed)
                return View("AlreadyRSVPed");

            RSVPs guestsOnThisRSVP = new RSVPs(guestList);
            guestsOnThisRSVP.SetUpForInitialRSVP();

            return View(guestsOnThisRSVP);
        }