Over the first weekend of the festival, some of the world’s finest chamber musicians come together for three concerts. For the first, two greats of the chamber music repertoire open the musical side of the festival: Shostakovich’s Piano Quintet in G minor, Op.57 and Mendelssohn’s Octet in E-flat Major, Op.20. Emerging ensemble, the Fibonacci Quartet, returns to the festival for the latter, for the first of two performances.