The "Harry Potter Reunion" refers to a special event celebrating the 20th anniversary of the release of the first film, Harry Potter and the Sorcerer's Stone. This reunion, titled "Harry Potter 20th Anniversary: Return to Hogwarts," features original cast members, including Daniel Radcliffe, Emma Watson, and Rupert Grint, reflecting on their experiences during the filming of the series. The reunion was released on HBO Max on January 1, 2022. It includes behind-the-scenes footage, interviews, and nostalgic moments, allowing fans to revisit the magical world of Harry Potter and see how the franchise has impacted their lives and careers.