A pair of tickets to Sarasa Chamber Music Ensemble playing DvoÅÂ?ák String Sextet in A Major and Brahms String Sextet in G Major. Winning bidder has a choice of attending the concert in Cambridge or Concord, MA (same program). In Cambridge: 8 pm Saturday, May 30, 2015 at Friends Meeting House, 5 Longfellow Park (near Harvard Sq.). In Concord: 7 pm Sunday, May 31, 2015 at First Parish in Concord (in Concord Center). Players include Haldan Martinson, violin (BSO principal 2nd violinist).