I can't remember that far back, but my early concerts were The Rolling Stones, the Beach Boys, Peter, Paul & Mary, and Deep Purple.
I had to leave the latter one early because the two guys who went with me got too stoned to enjoy it. (I didn't partake.)
UPDATE: I almost forgot! My sister begged me to take her and her friend to see The BEATLES in Cincinnati. So they bought my ticket and paid for the gas. The concert was rained out! So we came back on August 21st, 1966 to see Cyrkle open for them with their popular tune Red Rubber Ball. Then the Beatles came out to a bright sunshine to sing songs that no one could hear because the screams were so loud!