What prisons did the grateful dead play in 1971?

In 1971, The Grateful Dead performed at two notable prisons: the San Quentin State Prison in California on December 24, and the California Institution for Men (CIM) in Chino on December 23. The San Quentin concert was particularly memorable, as it was recorded and later released as part of the band's discography. These performances were part of the band's unique approach to music, reaching audiences in unconventional settings.