(SHOWCASE) NWNW is the small-plate performance festival of the year, with a little theater, a little dance, and a little video. This year's menu includes the avant-comedy duo the Cody Rivers Show, a sensitive zombie character, a fictional aging country star named Betty Crump, and dancers from Vancouver to Idaho. (On the Boards, 100 W Roy St, 217-9888. 5 and 8 pm, $14. See www.ontheboards.org for full schedule, through June 18.)