The Mill Valley film festival customized for adrenaline junkies, outdoor lovers and documentary film buffs arrives once again at the Throckmorton Theatre this month with the 8th Annual MountainFilm adventure and environmental documentary festival. The event runs Sept. 20-22 with “30 culturally-rich, adventure-packed, inspiring documentaries curated from the Mountainfilm festival in Telluride, Colorado,” according to festival organizers.

This year’s films include Changing the Game, a story of three transgender high school athletes navigating the complex world of sports and gender; (people) of water, which chronicles Rob Prechtl and the U.S. Men’s Rafting team’s attempt to take on outrigger canoe racing and the Na’Pali Challenge; and The Serengeti Rules, a visually stunning, poignant film that shares the story of a group of globe-trotting scientists and their discovery of a radical new theory of the natural world. ​

Other notable films and events this year include: Detroit Hives, which explores the importance of bringing diversity to beekeeping and rebuilding inner-city communities one hive at a time; and R.A.W. TUBA, which follows Dr. Richard Antoine White’s incredible journey from homelessness to world-class symphony musician, professor and the first African American in the world to receive a Doctorate in Music for Tuba Performance.

The festival comes to a close Sunday evening with a screening of the expectation-defying documentary Fire on the Hill about the Cowboys of Compton and South Central L.A. plus a post-film Q&A with Director Brett Falletnine and film subject Ghuan Featherstone.

The 411: Throckmorton Theatre’s 8th Annual MountainFilm Fest is Sept. 20-22. 142 Throckmorton Avenue. MORE INFO & TIX.​ All-access passes available here. Here are trailers from some of the films at the 8th Annual MountainFilm fest at the Throckmorton: