(Photo by CAROLINE LOBSINGER) A few of The Festival at Sandpoint’s many volunteers gather for their annual picnic in preparation for the start of the 2017 summer concert series next week. The annual concert series, which runs Aug. 3-13, showcases eight nights of music under the stars on the shores of Lake Pend Oreille in Sandpoint. The season line-up serves up its trademark eclectic mix with headliners Pink Martini, The B-52s, Jake Owen, The Head and The Heart, Iration, The Wailers, George Thorogood and The Destroyers and the Spokane Symphony conducted by Gary Sheldon with piano soloist …