Twenty-five years after Eminem released his hit “Stan,” the Shady Films-produced STANS documentary is set to premiere on the opening night of the SXSW London Screen Festival on June 2.

Along with Stans, SXSW London announced its closing-night feature, the U.K. premiere of The Life of Chuck. Directed by Mike Flanagan, the film is based on Stephen King’s 2020 novella of the same ...