Artist Nicolas Gonzalez-Medina spoke out from the stage on Saturday, in front of about 200 people: He’s an undocumented immigrant, living in the United States without government permission. And he doesn’t care who knows it. The roar of applause that greeted his proclamation couldn’t drown out the danger of arrest and deportation, especially in Philadelphia, a city that’s home to one of the nation’s most aggressive Immigration and Customs Enforcement field offices, and where undocumented migrants commonly live in the shadows. “For me it’s a responsibility, to share my experience, my art and my voice, and give people a little courage,” Gonzalez-Medina said in an interview.