Feats of flight and daring-do aren't just confined to circuses anymore. The Amp'd Mobile World Supercross is jumping, flying and roaring into the Georgia Dome Feb. 25. Brave moto-bikers such as reigning champs Ricky Carmichael and James "Bubba" Stewart are launching themselves off some sweet, man-made jumps. The main event doesn't start until the evening, but practice and qualifying rounds are held in the afternoon, not to mention a pit party in the 500 truckloads of dirt that were shipped in to create the battleground. $10-$42. Qualifying: 12:30 p.m. Main event: 7 p.m. Georgia Dome, 1 Georgia Dome Drive. 404-249-6400. www.gadome.com.