Halloween falls on a Friday night once every seven years or so, so of course local venues are capitalizing on the occasion and going all-out tonight. Here are some of the best Halloween events that neighborhood venues, bars and theaters have to offer – nationally touring musical acts, local concerts, costume contests and a Halloween cinema staple. Halloween Bash and Costume Contest with Sir Mix-a-Lot, 9 p.m., The Hive, 207 N. First Ave., Sandpoint. Yeah, you read that right: Sir Mix-A-Lot. His most famous track, a goofy, ribald ode to ample posteriors called “Baby Got Back,” unexpectedly rocketed its way up the charts in the summer of 1992, and what once seemed like a fluke novelty hit refuses to die: You can’t go a night in any karaoke bar without hearing somebody belt it out, it’s still being parodied and referenced on TV ads, and Nicki Minaj liberally sampled it in her most recent hit “Anaconda” (which makes “Baby Got Back” sound like Mother Goose). Mix-a-Lot (real name Anthony Ray) is a Seattle native who famously performed with the city’s symphony earlier this year, and he plays at the Hive in Sandpoint this evening. I think the odds are pretty good that you’ll hear “Baby Got Back” at least once. To get more information about the costume contest, or to reserve a V.I.P. booth, visit www.livefromthehive.com. The show is 21+ only. $25; tickets are available through TicketsWest.