The 40th Street Summer Series will host monthly concerts at the green area behind the Walnut Street West Free Library, 201 S. 40th St. See Brian Sanders’ JUNK perform live tomorrow, Dan Blacksberg’s Hot Klezmers and the West Philadelphia Orchestra on July 22, and Worldtown Soundsystem on Aug. 19. Activities, giveaways, and opening acts begin at 6 p.m. The best part – free Ben and Jerry’s!!