Your first concert was to see who and when?

Bo Diddley. October 16, 1960. 
State of Texas Prison Rodeo, Huntsville, Texas, north of Houston. I was 14, went with my 18 year old sister and her husband.
Outdoor arena. A stage was set up for Bo and his incredible band in the arena.
The Prison Rodeo was an annual event with prisoners as the participants, Even though many of the participants were Black, the bleachers were still segregated at that time. Those stands were rocking while most of the Whites stayed relatively still.
 

Simon and Garfunkel, Sept 1966, Heinz Hall Pittsburgh.  Homecoming concert University of Pittsburgh

Simon and Garfunkel, Sept 1966, Heinz Hall Pittsburgh.  Homecoming concert University of Pittsburgh

Credence Clearwater Revival, 1968, I believe, in the old Salt Palace, SLC. The warmup act -- Ike and Tina Turner. A strange paring of bands indeed. Tina was more than I could get my 16 year old head around at the time. Wild!

I was 10 years old and I saw Alan Sherman.."Hello Mother ,Hello Father" Atlantic City Steel Pier..N.J...with Mom...like summer 1962...Does this count ?