Watch Harry Potter 20th Anniversary: Return to Hogwarts (2022) HD Full Movie Free on SolarMovie. Watch Harry Potter 20th Anniversary: Return to Hogwarts (2022) online free. Cast members from all "Harry Potter" films reunite in a retrospective special to celebrate the anniv...Cast members from all "Harry Potter" films reunite in a retrospective special to celebrate the anniversary of the first film, including interviews and cast conversations.