I consider myself a fairly experienced cruiser, but it doesn't occur to me that I have to reserve the shows in advance - yes, I know I have to do it once I get on the ship. But for our upcoming Harmony 7 nt trip, all the shows are sold out. Seriously? Can we show up and expect to get a spot or are we actually SOL? And what if we want to see the Aquashow, which isn't on the app? When did cruising get so complicated?