Late Show host Stephen Colbert is kicking off two weeks of coverage of the Republican and Democratic conventions—with Jon Stewart, no less!—and he got ready on Sunday by walking the floors of the Cleveland convention center and storming the stage. Dressed as his "Hungry For Power Games" character (a Hunger Games parody about the election), here is Colbert and his camera crew doing dry runs, taking pictures with convention-goers, and amusing visitors and staff before he made an unscheduled trip onstage: