There's a lot riding on this month's action in the ATLANTA ROLLERGIRLS competition Sat., AUG. 9. The Apocalypstix take on the defending-champion Toxic Shocks to see who will advance to the championship game, while the Sake Tuyas will face Knoxville's Hard Knox team. (The championship round will be held Sept. 20.) The Atlanta Rollergirls have sold out all the games this season in their new home, the Yaarab Shrine Center, and are ranked in the middle of the pack nationally, according to the Women's Flat Track Derby Association. With an eye toward next season, the local league will hold a workshop for prospective Rollergirls Aug. 20. $6-$15. Toxic Shocks vs. Apocalypstix, 5 p.m.; Sake Tuyas vs. Hard Knocks, 7 p.m. 400 Ponce de Leon Ave. www.atlantarollergirls.com.