At 7:30, Patrick McMonagle and Marjorie Nugent teach hambo variations. At 8:30, David Lamb will take the stage with a host of fiddling compatriots—the group known as Jam with Lamb! Between them, they will give you a mix of favorite polskas, gammaldans, and a few mixers. As a bonus, Bill Boyd will bring his hardingfele for a few springars, and Irene Myers will play a couple of springleiks. Class, 7:30; dance, 8:30–11 p.m. $15 (Skandia members, $10); kids, free. Info: publicity@skandia-folkdance.org, www.skandia-folkdance.org, or (425) 954-5262.