Pianist Glenn Pearson and special guests from Washington theater stages perform monthly this evening of showtunes, with proceeds from specialty cocktails and featured appetizers benefiting the Helen Hayes Awards, D.C.’s preeminent theater awards organization. Tonight, Monday, March 7, from 7 to 10 p.m. The Quill Bar at the Jefferson Hotel, 1200 16th St. NW. Free. Visit jeffersondc.com or helenhayes.org.