(June 4, 2021) – With the cap on attendance at Tanglewood this summer now doubled to 9,000, the stage door has opened for concerts by alternative country artist Brandi Carlile (8/21, 7pm), soul-gospel icon Mavis Staples (8/21, 7pm), and legendary folksinger Judy Collins (8/22, 2:30pm). Concerts by James Taylor and Ringo Starr have been postponed…