The Harry Potter Lexicon is a fan-created online encyclopedia of the Harry Potter series.
Steve Vander Ark, creator of the Harry Potter Lexicon, speaking at the Sectus conference in London in 2007
The Harry Potter fandom is the community of fans of the Harry Potter books and films who participate in entertainment activities that revolve around the series, such as reading and writing fan fiction, creating and soliciting fan art, engaging in role-playing games, socialising on Harry Potter-based forums, and more. The fandom interacts online as well as offline through activities such as fan conventions, participating in cosplay, tours of iconic landmarks relevant to the books and production of the films, and parties held for the midnight release of each book and film.
Potter fans wait in lines outside a Borders bookstore for their copy of Harry Potter and the Half-Blood Prince.
Fans dressed as Hogwarts students at Long Beach Comic & Horror Con 2011
Attendees of Sectus convention in London await the midnight release of Harry Potter and the Deathly Hallows
Millikin University students at their biannual Muggle Quidditch tournament, a form of live action roleplay.