I think the list would be shorter if we started with who would be LESS likely to play a harley event than sir elton john.
I went to see DAC play in Odessa TX back around 83. He played and sang for 3 hours, and came back for another 2hr encore. It was one of the best concerts I ever saw. The best was George Thorogood at around the same time in Lubbock at a sleazy little dive. He was in town for booked concert, and played this club under a diferent name; it was a $2 cover, and lasted over 6 hours.
They just don't make em like that anymore (sigh)