Got kind of curious about that myself after the question was posed. I did not figure the original band ever did as they were really only getting pretty popular with Duane Allman died. They don't appear to have played much in the 70s in Europe, but I found some notices that they headlined a festival at Knebworth in 1974.
Later on, I got to figure some of Greg Allman's arrest issues might have made it hard for him to get visas and it was probably just more profitable for them to keep playing in the US.
I did find note that Greg Allman and Cher did some dates together in Japan and Europe. Of course this tour from what is reads was also what done in the marriage for good.
― earlnash, Monday, 23 January 2023 22:44 (one year ago) link