CD art for Adam Lambert's Trespassing Matinee LA has announced that American Idol's Adam Lambert will star at its main event, taking place September 1 from 9pm to 4am at the LA Festival complex. Lambert appeared on stage in the L.A. production of the musical Wicked. He recently released Trespassing, his second studio album, following For Your Entertainment. The event will also feature actor/singer Taryn Manning performing her new single. For more information about the festival, click here.