I never saw MF with the Allman Brothers, but I did see them a few times with some VERY varied acts. Back in the wonderful 1970's when concerts were shows with 3 or 4 bands and promoters tried to give fans a good bang for the buck. I saw a lot of headliners get blown off the stage by up and coming acts -- REO Speedwagon especially. Their management booked two tours they regretted: one with Judas Priest right as "Sad Wings of Destiny" and "Sin After Sin" were getting popular and another with Rainbow after "Rising" with released. Bad news for REO!
September 2, 1976
Robin Trower/Angel/Mother's Finest
October 29, 1976
Blue Oyster Cult/Mother's Finest/Ramones
April 22, 1977
Lynyrd Skynyrd/Sea Level/Mother's Finest
September 29, 1979
AC-DC/Sammy Hagar/Mother's Finest