Calling ALL Harry Potter fans! HBO Max is celebrating the film's 20th anniversary with a HUGE reunion special. Harry Potter: Return to Hogwarts will feature Daniel Radcliffe, Ruppert Grint, Emma Watson, Helena Bonham Carter, Robbie Coltrane, Ralph Fiennes, Gary Oldman and more of your favorite actors, all together for the first time! You ready?! Harry Potter: Return to Hogwarts will air EXCLUSIVELY on New Year's Day on HBO Max.