1979 and 1980.
Gregg Allman played with the Nighthawks at the Movin’ On concert. I was front row, center for the performance. A guy from our dorm floor was the original bass player for the Nighthawks and hung out with the band and Gregg Allman the night before the Nighthawks performance on Saturday night. He told us to make sure we were in front when the Nighthawks began (he was with us). It was absolutely no surprise to us that Gregg came on stage after a couple of songs, although it had been rumored earlier in the week.