Bluegrass in the Park

What's that, you say? Summer's not over? More picnics to be had? Yes, indeed. Spread a (waterproof) rug on the lawn at Madison Square Park and soak up such rootsy talents as the Nashville Bluegrass Band (in the headline slot), with support from Valerie Smith & Liberty Pike, the Cherryholmes Brothers, the Donna Hughes Band and show-opener Della Mae.