The City of Falls Church sponsors concerts in the park in the summer. Tomorrow night will be Andrew Acosta and the Old Time String Band. The band's music has a "repertoire of traditional American roots music." As quoted from their website: http://www.andrewacosta.com/the-new-old-time-string-band/
I haven't gone to this in a long time but I believe they have FREE ice cream, pizza slices for sale, water for sale for a dollar or two and hopefully artwork to browse.
Please bring a blanket, and any picnic food you want to eat for dinner or for a snack.