I was at that ELO show in 1982. I mostly remember this little robot coming out on stage and whirring around. It was the "Time" LP tour.
I don't remember them having to do a huge medley of hits, but I'm sure they did.
Hall and Oates were quite good. I at least got to see GE Smith play live which at the time was cool to me.
I'm not much of a fan of medleys as I'd like to hear the entire song. To me, medleys smack of playing Vegas. However, if you do have a huge log of hits, you have to try to please everybody and play at least a snippet each one.