Stevie Wonder performs free pop-up concerts in **rtheast Stevie Wonder is performing free pop-up concerts in Washington, Philadelphia and New York.The D.C. ****** of Motion Picture and Television Development says Wonder performed a few songs at the D.C. Armory Mall on Monday. The first 1,000 people got doughnuts.The concert is part of a news conference promoting Wonder's "Songs in the Key of Life Performance" tour.In Philadelphia, a huge crowd...