Spiked X in the City, taking place Oct. 22-24 at London’s ExCel exhibition center, is being touted as the world’s biggest participation action sports event. There will be nine “zones” for various activities, including Freestyle, Art of Combat, Parkour and Roller Derby. More than 200 world-class athletes and riders will be participating in 31 sports. Information is at xinthecity.co.uk.