Post-punk rockers the Cops were one of my longtime favorite Seattle fun-time bands. Then they broke up. Why? I don't know. Tonight they'll return to the stage for a one-time-only performance. Why? I don't know this, either. I do know, however, that they'll be performing songs from their entire catalog and they'll be playing with Thee Sgt. Major III and Eugene Wendell & the Demon Rind. It will surely be fun times again. (Tractor Tavern, 5213 Ballard Ave NW, 789-3599. 9:30 pm, $10, 21+.)