I would make ADR's just to be safe. However, after talking to a really nice CM at dining reservations the other day, I discovered that it's much, much easier for a party of 4 or smaller to score tables than it is for a larger group. Still, dh and I were able to make last minute ADR's for CP on Memorial Weekend Sunday (I think we called right after a cancellation with this one) and lunches at WC, Mama Melrose, Brown Derby (actually chose to try MM instead), and Marrakesh (nearly empty). We were able to walk-up and get a table for Alfredo's one evening. Again, I think we were just really lucky; because they were turning walk-ups away when we left.