Harry Potter and the Prisoner of Azkaban (film) 2004 in Europe. Mattel released film tie-ins that included the "Harry Potter Championship Quidditch" board game and character action figures. Lego also expanded on its previous merchandising for the first two films with the release of sets ranging from the Knight Bus to the Shrieking Shack. "Harry Potter and the Prisoner of Azkaban" held its New York premiere at Radio City Music Hall on 23 May 2004, followed by its London premiere at Leicester Square on 30 May 2004. The film then opened in the United Kingdom on 31 May 2004 and on 4 June 2004 in the United States.
The Magical Worlds of Harry Potter it was "cool that their hero, Harry, was encountering some of the creatures of mythology." Colbert felt that knowing the origins of Rowling's character and creatures increased "the books' magic tenfold" and made the "Harry Potter" universe seem more lifelike. Feeling that he wanted to share this with others, Colbert spent a year researching the references in the novels and collected his discoveries for a guidebook to the magical world of Harry Potter. Colbert wrote "The Magical Worlds of Harry Potter" while teaching a seminar on self-publishing to graduate students at the University of North Carolina. He had it self-published