Santa is scheduled at DTD pretty much everyday from Thanksgiving through Christmas. We did see him at
MVMCP last time we were there and it was great. The kids kept says how lucky we were that Santa happened to be a Disney when we were. It was precious. Also, I didn't have to fight the Mall crowds when we got back home. One of the other things we really liked last time was in Epcot. Almost all of the pavillions had versions of their own Santas or Santa-like characters who would talk to the children and tell stories. It was very fun and interesting!