I too love these books!
I was actually "lucky" enough to work at a book store during the release of boox 6 (the second last one). What an INSANE experience. It was busier than Christmas Eve. The store I worked at went all out though. We had a magician walking the aisles, a palm-reader set up in the travel section, and different craft stations set up to coordinate with the stores on Diagon Alley (wand making at Olivander's wand shop, free treats at The Leaky Cauldron, etc.), and everyone working was dressed up as a character from the book.
For the last book, I wasn't working at the store anymore, but I had to stop by to see what they had set up this time around. It was just as crazy, but definitely an experience worth being a part of...and yes, I waited around until midnight to pick up my copy. I then proceeded to read the book and was finished by two a.m the next day (Sunday)