The folk-pop singer-songwriter Erin McKeownreleased her last album, 2009's Hundreds of Lions, on Ani DiFranco's Righteous Babe Records label, and opened for DiFranco earlier this year. She stops through D.C. for a free performance. Thursday, Aug. 19, at 6 p.m. Kennedy Center Millennium Stage. Tickets are free. Call 202-467-4600 or visit kennedy-center.org.