Hi, I have never been on the WOnder, but have been on the Magic 3 times, and I know they have lots of different time slots, I Believe the last one is 9:30. I could be wrong about the time on that one though.
If I were you I would go to dinner for the last night, nice show, and make the latest Palo reservation possible, so that you get to enjoy both the final dinner and your Anniversary!!