EAC’s Concert Series continues at 7 p.m., Friday, July 29, with a special family concert by Paul Biss, violin/viola, Miriam Fried Biss, violin, and Gregory Biss, piano, in celebration of the latter’s 80th birthday. The brothers Biss and sister-in-law Fried will play the Duo for Violin and Viola, K423, by Mozart; 10 Duos for Two Violins by Bartok; and the Sonata in C major for Piano and Violin, K296, by Mozart.