Shout Across the River is a stage play, written by Stephen Poliakoff, which premiered at the RSC Donmar Warehouse (at that time called The Warehouse) in London in September 1978. It was directed by Bill Alexander. It featured Gwyneth Strong in the lead role of a troubled eighteen-year-old girl. The cast also included Lynn Farleigh, David Threlfall, Nigel Terry and Andrew Paul.
Shout Across the River premiered in 1978 three months before Halloween
Halloween is on October 31. The context says that Shout Across the River premiered in September 1978. September is the month before October, so it is incorrect to say the play premiered 3 months before Halloween. The system was likely confused because it doesn't know the date of Halloween. 