Albus Severus Potter has finally left for Hogwarts.

Harry Potter author J.K. Rowling, some of the film franchise’s cast members, and countless fans are celebrating Sept. 1, 2017, the date Harry Potter’s son headed to the wizarding school on the Hogwarts Express for the first time. The sequence, written by Rowling as the epilogue of Harry Potter and the Deathly Hallows and set 19 years later from the events of the books, kicks off the Potter play, Harry Potter and the Cursed Child.

Rowling marked the occasion on social media.

As did the Cursed Child production, with a special video explaining the significance of performing the show on the same date it begins.

Actors Oliver Phelps (who played George Weasley in the Potter franchise) and Warwick Davis also paid their Potter respects.

Potter fans, meanwhile, descended upon King’s Cross train station in London, where platform 9 3/4 resides (both in the books as part of the wizarding world’s path to Hogwarts and in reality as a tourist attraction).

Head here for full EW coverage of “19 Years Later.