If it was a smaller animal show, I feel like we would've heard or seen something regarding an animal trainers. I overheard one of the trainers after the final performance for AA say that he's moving out of state since there's no more work for him at the park for his position (Which sucks and I wish him nothing but the absolute best for him!).
If I were a betting man, I think the venue will be set up to have multiple different shows at the venue. Why else would you call it the "Universal Amphitheater" instead of a specific show? Maybe for one set have the Blues Brothers perform and then another set have Beetlejuice?