If you are unable to get an ADR, you may want to check with your hotel...we were referred to the Swan, which had a special buffet set up in the meeting/banquet rooms.
They had a lot of different characters stationed around the room, and we did not have to have reservations to get in (while many had reservations, they were working people in and we did not have a long wait). It was typical Thanksgiving-type fare. It was not cheap, but based on all the characters we saw we thought it was worth it.