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Accordionist Aldus Roger and the Lafayette Playboys and fiddle player Harry LaFleur (pictured) and the Pine Grove Boys have been performing high-quality Cajun music for some 40 years now. Double-billed for “A Special Tribute to Cajun Music,” these vets deliver flawless waltz-tempoed compositions that are as danceable today as they were decades ago. Dance workshop at 8 p.m., music at 9 p.m. at Glen Echo Park’s Spanish Ballroom, 7300 MacArthur Blvd., Glen Echo. $10. (301) 309-0895. (Steve Kiviat)