It must be late 80ies or 90ies (because of the cheerleaders), but I wouldn't know the exact date. I just checked Eric Anniversario's great setlist-site (
http://fun_fun_fun.tripod.com/setlists.html) but this isn't mentioned (yet).
But who knows it might pop up on AGD's (and Ian's) "tours and sessions" webpage (
http://www.btinternet.com/~bellagio/gigs.html). They've already entered 1988, so you might have an answer within a few months...