Damaris: Are these "extras" just coming along for the vacation, or are they expecting to attend the wedding too?
Amanda: it's insane if people haven't RSVP'd, but suddenly show up for your wedding! How on earth do you plan for favours, OOT bags, etc., etc.?? Would the hotel be able to tell you how many are booked for your wedding? (I'm assuming you didn't use a TA or s/he would be able to tell you how many are coming).