The Uptown Theatre closed in 1981, making this show by The Grateful Dead one of the last to be held there. I was 12 at the time, too young to really know who The Dead were, let alone be allowed to go to a concert, but I bet it was an amazing show. (My first concert, I'm embarrassed to admit, was Corey Hart from his "Sunglasses at Night" phase. I was 15.)
I did find a link where there is streaming audio of their performance from the February 27, 1981.