I don't know why WB hasn't done this more in the past. There are tons of HP events using the name and all sorts of things from the movie/books. There was one here(where I live) just a few months ago for the March break for the Elementary School kids that were off. All the posters advertising it had HP all over them. Then again, it was a theatre that organized it so they might have stopped and asked permission. *shrugs* well, I'm not so surprised that this has happened but I don't understand why it's not happening more.