The DaPonte String Quartet’s Summer Series in August features guest violinist Petros Karapetya (see photo). The program will be Francaix’s String Trio in C; Stravinsky’s Three Pieces for String Quartet; Stravinsky’s Concertino for String Quartet; and Brahms’ String Quartet in C Minor, op. 41, no. 1. Robinhood Free Meetinghouse, Georgetown. For tickets and additional information.