Just run the new lagoon show during the event. Sure, it's not HHN specific...but neither is Rip Ride Rocket, The Mummy, Harry Potter, MIB, Minions on display, Springfield, Dreamworks Land, etc.
A LOT of people come from out of town for HHN and aren't locals who will have seen the show this summer, myself included, and would LOVE to see it. It should eat up a decent number of people each night so the locals who would be mad that it's there would benefit, in theory, with shorter lines during show times.