The Grateful Dead played at the old Boston Garden more than any other band (24 appearances between '73-'94). They were supposed to be the last band to play there prior to it's closing in 1995. In fact, according to Wiki, they were supposed to be the final event there on 9/19/95.
As it turns out, the final event there was an exhibition game between the Boston Bruins and the Montreal Canadians on 9/26/95. My GF (now wife) and I were in attendance, and got to witness the lowering of the Banners and retired numbers. We have some great pics somewhere! When it was half demolished, I drove by on RT 93 South and took a pic from the highway of the gaping barn! Man, do I miss that place!
https://en.wikipedia.org/wiki/Boston_Garden