Here are the possible solutions for they gave their last public concert in 1966 clue
Answer
Clue
Relevancy
beatles
Clue
They gave their last public concert in 1966
ustour
Clue
The Beatles had their last one in 1966
rockbottom
Clue
With 133, the name of the band whose members appear in the theme answers. (They disbanded in 2012 after raising millions for literacy, but they're reuniting this weekend for one last concert.)
bonnaroo
Clue
Festival where the Beastie Boys gave their last performance
promisers
Clue
They gave their word
Definition
PROMISER, one who promises, also PROMISOR, PROMISSOR
shea
Clue
1966 Beatles concert site
1965 and 1966 concert site for this puzzle's subjects
dormice
Clue
They got their name from their hibernation
Definition
DORMOUSE, any member of a family of rodents related to mice
