I'm not sure of the exact answer to your question. Have you thought about just booking the FFN night on Friday night once you know your schedule for the next day? You can book FFN nights with no advance notice if you call Hyatt C.S. If availability is a problem with these hotels then I guess you might have a difficult time. Possibly you can book and then cancel Thursday afternoon and then hope your night is still there when you know your schedule 24 hours later. Also others here have had success contacting the hotel directly. This would seem a sure bet for somebody in your shoes. If you know on Sat. afternoon that you want to stay there Sat. night and there are no award nights left when you call Hyatt C.S., try the hotel directly. It seems to me there would be a good chance of them giving it to you if they have ANY open nights because I would assume odds are that they aren't going to sell many remaining rooms to walk-up guests. Just my suggestions, they might be worth a try.