Sign o’ the Times (Concert Film) Northwest Film Forum kicks off its 20, 30, 40: A Trio of Anniversary Concert Films series (also featuring Lasse Hallström’s legendary ABBA: The Movie and D. A. Pennebaker’s Dylan classic Don’t Look Back) with the greatest concert film ever made that’s not Stop Making Sense. On both record and celluloid, Sign o’ the Times captures Prince at his all-time best, with a minimum of crappy plot elements and a maximum of rock ‘n’ funk ‘n’ roll. (Northwest Film Forum, 1515 12th Ave, 267-5380. 7 and 9:15 pm, $8.50/$6.) David Schmader

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Nortec Collective (Music) Tijuana, Mexico, 3:00 a.m.: Bass-heavy European techno spills from an all-night disco, mingling with horn-laden norteño from a transistor radio and American hiphop from a passing car stereo. This intoxicating city is on the busiest border crossing in the world, and the sound of its daily—and nightly—reinvention is Nortec Collective. The five-man production crew samples traditional Northern Mexican instruments—tuba, accordion, timbales—over modern dance music production, making music unstuck in time and place. (Chop Suey, 1325 E Madison St, 324-8000. 9 pm, $12, 18+.) Jonathan Zwickel