I made that 1970 outdoor concert in Byron as well.
Best show was that fall 1970, at the Carolina coliseum allman bros opened for Johnny Winter. Absolutely fantastic.
Grand Funk Railroad rated right up there
My Dad in Law has plenty of wild stories from the Atlanta Pop Festival in Byron, too. He was the Coke (the soft drink that is) delivery driver in and out of the place all weekend.
Saw Grand Funk opening for ZZ Top at the Omni one time, which was great, except for the acoustics.