We did this in Sept....it was super fun. We did this at the Beach Club. There is a campfire/singalong first...and they sell kits for S'mores. Then the movie (Disney of course) is played on a huge inflatable screen on the beach and several loungers are set up. It is great fun...the kids make friends and run around and play on the beach and the parents get a chance to relax too. I think the campfire/singalong starts about 8, then movie at 9....but it depends on when it gets dark, so the times may change a bit.
At the Beach Club, there is a sign listing the time and movies to be played.