Conversation so far:
Did Charlie Haden do any performances during the 1980s?
In 1986, Charlie Haden formed his band Quartet West at Ruth's suggestion. The original quartet consisted of Ernie Watts on sax, Alan Broadbent on piano, and Billy Higgins, on drums.

Question: Which festival did he perform in?
Self-contained rewrite: Which festival did Charlie Haden perform in after he formed his band Quartet West at Ruth's suggestion?