What further praise can we throw at the Cody Rivers Show? We've called this local sketch-comedy duo "high concept" and "loopy" and "like a baby giraffe wearing a monocle and giving you a high-five." They're just the best thing ever, and choosing them for the opening act of Sketchfest 2007 was smart. North America's oldest sketch-comedy festival is two weeks long, with 15 groups from Los Angeles to New York, and hosted by the People's Republic of Komedy. Enjoy. (Erickson Theatre, 1524 Harvard Ave, www.sketchfest.org. 8 pm, $15, through Sept 15.)