Attendees can even sign a birthday card for Harry. Image: Warner Bros "Happee Birthdae Harry!" 31 July marks one of the most famous birthday in fiction, that of wizard extraordinaire Harry Potter.

When is Harry Potter's birthday? According to the books, Harry Potter was born on July 31, 1980, making him 45 this year. Watch it here: Stream your favorite shows, the biggest blockbusters and more.