I would definitely try to check in early for your PS. Then maybe you can get seated earlier. You might consider going to the Contemporary to watch them from there instead. But even if you are just inside the entrance, even though the view isn't quite as good, they are still beautiful, and the music is great! Go for it! I would!! But at the same time, enjoy your dinner. Don't miss out on the experience of it because you're worried about the time.