I’m David L. Coddon, and here’s your guide to all things essential in San Diego’s arts and culture this week. Singer-songwriter Michael Tiernan modestly calls it “one of the lesser known, longest-running showcases in San Diego.” Fans of this local musician, however, have known about Tiernan’s “Acoustic Wednesdays” showcase since he began hosting it “many moons ago, back in 2006 or 2007” at En Fuego Cantina & Grill in Del Mar. Every Wednesday, Tiernan would preside over an evening of music, performing and presenting other area artists to audiences. Advertisement “It became kind of my office,” Tiernan recalled. “My listeners always knew I was there.”