Your First Concert was.....

My first concert was Arlo Guthrie at the Shaffer (sic) Music Festival in Central Park, NYC. It cost 2 bucks and it was for his "Running Down the Road" album.
Interesting thread .. I'd have to say my first real concert was a regional band in northern Wisconsin known as the American Tea Company. The location was either the Depot in Merrill or The Hole in Tomahawk. This was 1967 or 1968. Can't really remember. The lead singer looked and sounded a lot like Jim Morrison, and they had this weird keyboard called a Hammond B3. ;)

I am still going to shows today. In the summer I work in security for Live Nation at Alpine Valley Music Theater in East Troy WI.

Trying to stay focused ...
Dreadhead .. you have me beat...

My first Dead show 10/25/73 .. wall of sound show. Kinda muddy sounding, must have been all those McIntosh amps. ;) Just kidding!

I went with my girlfriend, who became my wife the next year. We left after the first set, I was too much into arena rock at the time to understand the Dead.

10/25/73 (Thu) Dane County Coliseum - Madison, WI

Set 1: Here Comes Sunshine, Black Throated Wind, Mexicali Blues, Tennessee Jed, Looks Like Rain, Deal, El Paso, Playing In The Band

Set 2: China Cat Sunflower > I Know You Rider, Me & My Uncle, Dark Star > Mind Left Body Jam > Dark Star > Eyes Of The World > Stella Blue, Weather Report Suite Prelude > Weather Report Suite Part 1 > Let It Grow > Goin' Down the Road Feeling Bad > One More Saturday Night, E: Uncle John's Band
1970 (or '71?) - Olympia Stadium - Detroit, MI - 5th row - Alice Cooper and Steppenwolf. When Steppenwolf played "Pusher", with that awesome Hammond B3 and the searing, ear-splitting lead guitar my life changed. I went from being a stupid teenage boy, to a stupid teenage boy with an obsession: loud, raunchy, fuzzy, BLUESY, funky, rock-and-roll. My virgin ears rang for days. I still love that kind of music.
I had to dig deep on this one, it's embarassing .. my first real concert was the Supremes at Disneyland, September 1970.