With their powerful songs of protest, Peter Paul and Mary did have a hammer—and they used it well. The Grammy Hall of Fame trio behind such hits as “Puff, The Magic Dragon” and “Leaving on a Jet Plane” was a historically significant staple at Ravinia from their festival debut in 1963 through the pinnacle of the folk era. Now Peter Yarrow and Noel Paul Stookey reunite for their long-awaited return to Ravinia on Sunday, June 16.  Get $17.50 tickets from Goldstar.