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If the DIY punk ethic is a lifestyle choice, what do you do when your band isn’t playing? While there are always 7-inches to stuff into plastic sleeves and tribute albums to ponder, down time usually leads to a side project. “Super Slippery City” is a showcase of 10 such efforts; some musicians are discovering the keyboard (Plastic Pianos) or singing in French (Papillion D’Amour), while others are trying free jazz or just going all-out pop. It’s a laid-back minifestival that finds strength in numbers and takes comfort in familiar faces; each band gets 10 minutes, so nobody gets too indulgent. From Quix*o*tic to C’mere Camille, these groups include members of Cranium, Crom-Tech, Aylers Angels, Cold Cold Hearts, the All-Scars, and Jetlag. Expect plenty of lo-fi and lowbrow. (That’s a good thing.) At 8:30 p.m. at the Black Cat, 1831 14th St. NW. $3. (202) 667-7960. (Jason Cherkis)