Every Thursday night on the southwest corner of 16th and Mission, a crowd begins to gather. A woman will kneel down and take out sidewalk chalk, patiently tracing a sprawling pastel circle on the concrete. At 9:30, the first poet will step into the chalk and let loose a yawp

Every Thursday night on the southwest corner of 16th and Mission, a crowd begins to gather. A woman will kneel down and take out sidewalk chalk, patiently tracing a sprawling pastel circle on the concrete. At 9:30, the first poet will step into the chalk and let loose a yawp