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As an artist-in-residence with a grant from the National Park Service, Beth Davis has used her space at Glen Echo Park to provide a venue for both emerging artists and established performers seeking feedback on new work. This year’s “Hall of Mirrors” series opens with a collaborative triple bill: the Tasvir Guitar Quartet, a modern acoustic guitar ensemble, experiments with electronic sounds; Davis and Catherine Eliot perform an extemporaneous dance on cubism; and Alloy, a trio comprised of local dancers Alicia Grayson, Peter Olsson, and Ken Nanhiemer, presents what it calls “contact-improv.” Let’s hope they don’t try too hard to do anything, because as Grayson notes, “that’s when [improvisation] really works.” At 8 p.m. at Glen Echo Park’s Hall of Mirrors, 7300 MacArthur Blvd., Glen Echo. $8. (301) 229-6022. (Brook J. Sadler)