Which 2016 stage play did J.K. Rowling co-author as a story creator?

J.K. Rowling co-created the story for the 2016 stage play Harry Potter and the Cursed Child.

The play was written by Jack Thorne and directed by John Tiffany, with Rowling credited as a story creator. It is set nineteen years after Harry Potter and the Deathly Hallows and follows Harry’s son Albus Severus Potter as he begins at Hogwarts.

The original production opened in London’s West End in 2016. It was initially staged in two parts, designed to be seen on the same day or on consecutive days. The story explores the relationship between Harry and Albus, as well as Albus’s friendship with Scorpius Malfoy, Draco Malfoy’s son.

Cursed Child is a stage play, not an eighth novel by Rowling. Its published script uses dramatic scenes and dialogue rather than the narrative form of the seven main books. That difference explains why references to it should identify it as a theatrical continuation.