Extreme athletes use all sorts of devices to propel themselves into the air, including skateboards, BMX bikes, skis and, in the case of Pogopalooza, pogo sticks. Over three days, pogo-ers from around the world will spring into action to see who can grab the most air, pull off the best trick and challenge five world records. OC Fair & Event Center, 88 Fair Drive, Costa Mesa. 1-4 p.m. Thu. 4-9 p.m. Fri. and Sat. $12.50 each day (includes admission to the OC Fair). (714) 708-1500. http://www.xpogo.org/pogopalooza.