As the PP, you have to wait until the machines start distributing FPs for the second show. The best you can do is to wander over to the area and ask which show is currently being distributed. I wish that you could select a show, but they've never instituted that with WoC, so I doubt they'd do it for F!.
You can try bringing a FP for the first show to the second show and see if you can get a little pixie dust sprinkled on you. It's probably going to depend on the CM you encounter, so I wouldn't count on being able to always do that - especially during periods when the park is busy.