Hmmmm…………
60s
Clancy Brothers and Tommy Makem Lyric Theater, Baltimore, MD
The Association Lyric Theater
Iron Butterfly (Columbia, MD)
Jethro Tull, Led Zepellin, Johnny Winters, Edwin Hawkins Singers and a few others I don't remember, all in one night

and 50 ft from the stage. Laurel, Md. Pop Festival, 1969
70s
McKendree Spring
Bee Gees, Merriweather Post Pavillion
The Byrds, Loyola College
Chicago, Baltimore Civic Center, front row. I wore a suit, got there when the doors opened and asked Security if I could go down front and take light meter readings. They said "sure!"and I stayed in front all night. No problem!
John Denver, Ritchie Havens, Kenny Rogers and the First Edition, Grass Roots (or similar

), Nitty Gritty Dirt Band, all at Towson University. It helped I worked for the school paper and had full access. Negatives are around here somewhere.
Heart in a small club west of Baltimore
80s
Furey Brothers and Davey Arthur Amazing Irish traveler music
Victor Borge, Frankfurt Opera House
Marcel Marceau, Frankfurt (his father was in the WWII French Resistance, killed by the Nazis)
Marriage of Charles and Diana, London. Helluva show. A buddy of mine and I slept on the streets across from St Paul's Cathedral.
P.D.Q. Bach, San Antonio
90s
John Hartford
Kingston Trio
Red Skelton
Battlefield Band
00s
Moody Blues
Eddy Izzard
Riverdance
Itzaak Perhlman
Winston Marcellus
Hal Holbrook
Garrison Keillor Rhubarb Tour
10s
Moody Blues
Kathy Matea (x2)
Arlo Guthrie
Dougie Maclean
LadySmith Black Mambazo
Garrison Keillor
A few more I can't recall…………