Maneuvers reign supreme at Battle Slam Jam — happening on Aug. 21 (rain date on Aug. 28) at Grayson Skate Park. In its fifth year, this outdoor fest features skateboarding contests, graffiti writing, freestyle soccer, custom cars, music from DJs and live performers (including Pradigy Alpha Theory, Jocelyn Ellis and others) and more. Free admission. 10 a.m.-6 p.m. Grayson Skate Park, 750 Beal St. For more information, visit www.battleslamjam.com.