How about an interactive hedge maze - within a building to maintain ambiance and lighting - akin to the one from Goblet of Fire and it has the fighting elements of that dungeon crawl thing Universal opened in Japan?
You don't have any freaking idea how well it would translate in the long run, the issue would be size to fit large numbers of people at a time and providing something for those without wands to participate. A large mix of live actors, screens, practical sets, and AAs all in one.