You will make reservations for dinner at the concierge desk, which is separate from checkin. I guess if there was a wait to checkin you could make your reservations. I wouldn't worry about it too much though. Only 2 restaurants require reservations, and you can only book up to 3 days out. So if you tried Wednesday, it would only be for Wed, Thurs, and/or Fri. We never had an issue getting day/time we wanted and resort was at full capacity.
If i had a scanner I'd scan my activities schedule I got in May, although I don't know how often they change. Were you looking for something specific?