The Cape Cod Chamber Orchestra’s fourth season kicks off with a performance of Dvořák’s Serenade for Strings at Pilgrim Congregational Church, 533 Route 28 in Harwich Port, on Sunday, Aug. 29, 3 p.m. The event also includes a behind-the-scenes look at the rehearsal process and a lecture. Tickets are $35 at capecodchamberorchestra.org.