Keegan-Michael Key, Max Greenfield, Jack Black and Judy Greer are among the thesps lined up to perform at the Young Storytellers Foundation’s 12th annual The Biggest Show fundraiser, set for Oct. 24 at New Roads School in Santa Monica, Calif.

The non-profit Young Storytellers org sends volunteers into dozens of Los Angeles-area public elementary schools to work with fifth grade students on developing short screenplays.

Over the course of eight weeks, the students learn the basics of crafting a dramatic narrative by working one on one with mentors, many of them industry writers. At the end of the program, each student’s screenplay is brought to life at an evening event for family and friends with a group of volunteer actors.

The Biggest Show event takes selected screenplays from throughout the previous school year for a staging that also serves as the org’s biggest annual fundraiser. The cast for this year’s Biggest Show will also feature Tom Lennon, Jason Mantzoukas and Stephanie Beatriz of Fox’s “Brooklyn Nine-Nine.” Brothers Randy and Jason Sklar will serve as hosts.

Young Storytellers Foundation was formed in 1997 by a group of film students that included future “Glee” and “American Horror Story” co-creator Brad Falchuk.

(Pictured: Keegan-Michael Key, Max Greenfield)