It may send your mind reeling back to the dreaded fundamentals of geometry, but R Gallery’s “Quadrilateral” is not an artistic ode to trapezoids, parallelograms and their four-sided friends but a group show uniting local artists: Albert Alvarez, Francisco Garcia, Christopher Montoya and Jerry Villarreal. Employing fairly traditional materials (graphite, oils, acrylics, pen and ink), the quartet finds common territory via street-smart aesthetics, irreverent subject matter and shared themes ranging from violence and depression to horror and science fiction. Curated by Rigoberto Luna, the exhibit comprises poppy new offerings and the site-specific mural #Flexicano
by Christopher Montoya (known best for his homages to Selena and the Spurs Coyote); obsessively rendered — and often nightmarish — drawings by Albert Alvarez; anxiety-ridden examples of Jerry Villarreal’s series Cloaking the Goose
; and bizarre, cartoonish creations courtesy of Francisco Garcia. Sponsored by Pedernales Brewing Company, this second of two First Friday receptions comes complete with DJ beats by Executive Realness and live music by horror-surf-rockers The Sandworms, singer-songwriter Mike Ryan and fusion-minded Latin funk/punk/reggae outfit Arma Musical. Free, 6-11pm Fri, R Gallery, 725 S. Presa St., (210) 650-2243, facebook.com/rgallerystx.