Yes. I booked for an end of April weekend trip at 30 days, and MOST things were fine with plenty of openings, but certainly there were exceptions, the most notable being the Anna and Elsa meet and greet, which I have thus far NOT been able to find on any day at 30 days out. We also have been able to change most but not all within 24 hours of being there, like when our breakfast ADR ran 2 hours late, for example...but we did run into a LOT of rides that were not available in that situation.