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Argentinians are always looking for an excuse to have asados, those marathon barbecues in which they slowly and artfully grill an entire cow, piece by piece. It’s all amazingly tasty stuff, but true connoisseurs know that morcilla, or dried-blood sausages, make the best appetizers. Washington-area asado lovers can celebrate the glories of cooked meat at “Argentina National Day,” which marks the country’s first step toward political (and culinary) independence from Spain. The all-day event includes games of truco (a kind of Argentine poker), soccer matches, and a tango contest. But most importantly, there will be plenty of meat—probably a few herds’ worth—so vegetarians beware. Performers include local guitarist KoKo Sosa, Mariela Bond, and Capital Tangueros. From 12:30-6 p.m. at Barcroft Park, Four Mile Run Dr. between George Mason Dr. & S. Walter Reed Dr., Arlington. FREE. (703) 358-6415. (Eddie Dean)