Everyone is invited back to Hogwarts. (Except JK Rowling)

The Harry Potter fam are back together for a reunion special to make us all feel a hundred years old.

Huge news for younger millennials: It is the 20th anniversary of the release of the first Harry Potter film and the gang is getting back together. In a TV event similar to this year's Friends reunion, the now-adult cast of the Harry Potter films will reunite for Harry Potter 20th Anniversary: Return to Hogwarts. It debuts on HBO Max Jan 1.

Producer Casey…