Motocross, originally developed in England, is a descendant of early 20th-century U.K. auto trials and came to be known as "the sport of kings." King George VI was known to quell his despondency over his speech impediment by riding in freestyle arenacross events throughout Europe on a custom Matchless G3/L with 350 cc sidevalves, made famous in the supercharged action scenes of Oscar winner The King's Speech. At 7:30 p.m., the Nuclear Cowboyz Freestyle Chaos tour brings its theatrical brand of high-octane motocross action to the Sprint Center (1407 Grand). A post-apocalyptic narrative pits rival tribes of FMX riders in freestyle competitions and choreographed performances, accompanied by the dance stylings of the Nuclear Cowgirlz. Basically, Freestyle Chaos is to the noble sport of motocross what Disney on Ice is to the dainty sport of Olympic figure skating — only more badass. Ticket prices range from $20 to $65. For more information, see sprintcenter.com.