I went Fri and Sat night too. I'd never been on Leviathan before, so I spent most of Friday riding the beast. Pleasantly surprised at the wait time and it was running so well at night. I'm not sure if the wet track helped. Leviathan impressed me, kind of a cross between Twister at Gronalund and Ghostrider. I really liked the upcharge back row (just the ride not the upcharge).
I caught a little of the show on Saturday and that looked spectacular. Otherwise, it seemed quite sparse, but the performers present were doing a good job. I tried the seafood boilup near Dockside, that was very average and poor value.
Definitely worth it for the night rides on Leviathan and Jet Rescue for me personally, definitely not for the event alone (I don't have a season pass).