Lyndon Institute is an independent secondary school at Lyndonville, in the Northeast Kingdom of Vermont, and its auditorium serves the double duty common to such halls in rural America: assembly room for the school by day, concert hall for the surrounding towns by night. Touring orchestras reach this corner of northern New England rarely, which makes each visit an occasion for a wide stretch of country rather than for one village. Lyndon Institute’s auditorium is a 650-seat performance and assembly space on the school’s campus in Lyndon Center, Vermont.