Now that the series is complete, these Harry Potter Celebrations would be a good addition for an annual thing. I just hope they're creative with it, like maybe a reading from one of the chapters from the books for the little ones, screening of a movie, and even revelations of future things coming from the Potter universe like Diagon Alley in UO and maybe the rumored 3D rereleases of the films. A scavenger hunt in Diagon Alley with interactive wands, and hopefully (Fans would go wacko, and tickets would be flying out the window) An appearance by the Golden Trio or even.....J.K. Rowling herself