Pick of the Week SATURDAY. First things first. I didn't know that from September to May, the feisty little Cajun ensemble Magnolia play every first Saturday of the month at the Trinity Brotherhood Hall (146 Sutton Avenue, East Providence). Had I known, I would have mentioned it earlier. Why? Because they're strong. The septet may be from 'round here, but their feel for tempo and touch will have you believing that they have Mamou in their blood. Their music is brimming with both scholarship and good feelings -- a refreshing combo in any setting -- and their Jolie Coeur (R&M Records) spins its two-steps and waltzes with an élan you expect the real deal Cajun stuff to carry. Second things second. Speaking of real deal Cajun stuff, for tonight's dance Magnolia will be joined by revered Louisiana fiddler Ed Poullard and accordionist Jesse Lege, a bayou pro who recently moved to Hope Valley (which boasts its own nifty bayou vibe, I'll add as one of the burgh's residents). This makes an already valuable gig an event of sorts. I'll bet you feel the spirit when you open the door. The night begins with dance instruction at 7:30; the show starts at 8. Tickets are $10. Call 246-2720.