Harry Potter 20th Anniversary: Return to Hogwarts 2022 A special retrospective, full title Harry Potter 20th Anniversary: Return to Hogwarts, will air on HBO Max in honor of the 20th anniversary of Harry Potter and the Philosopher's Stone. In this special meeting, actors from the eight-film Harry Potter series, especially the "golden trio" of the series, Daniel Radcliffe, Rupert Grint and Emma Watson will come together. Offering an in-depth look at the films in the series, the retrospective will feature in-depth interviews with the cast and crew, and take viewers on a magical journey through one of the most beloved franchises of all time.