Yes… I was at the Fillmore East quite a few times between 1969 and 1971. Concerts held there were usually inexpensive and not available any where else Since NYC was about an hour away…maybe even less. If they were recording that Allman Brothers show at that time, I never knew it other than eventually buying the album 3-4 years later?
I did see Ten Years After, Jefferson Airplane, Jethro Tull, Grateful Dead, Janis Joplin, Paul Butterfield Blues Band, Leslie West, John Mayall and a few I don’t recall right now but the are a lot. The first night of Woodstock, Friday August 15, 1969, we had $4.50 tickets to see Led Zeppelin at the Asbury Park Convention hall. It was with a few guys I was in a band with at the time. A few said they wanted to dump the tickets and head up north to the Woodstock event. My thinking was $4.50 does not come easy to us… let’s just stay and see this show …the New York Thruway was closed and they were reporting 300,000 people were already there. So we stayed and saw Zeppelin. My fellow guitar player friend Billy had a 1949 Cadillac. That’s what we’re would have driven to NY state with.
A guy named John Scher opened the Capital Theater in Passaic, NJ sometime after the Fillmore closed and had great shows there. We had seen Old and In The Way there, Mahavishnu Orchestra, Hot Tuna, Poco, Commander Cody . I was friendly with a guy who was his insurance man so we could get great tickets for almost any show. Only had to pay face value….usually the first 5 rows
My friends and I were concert goers…one night it was The Allman Brothers at the old Nassau Coliseum. Early 1970’s as well and that town had deputized people in town and they would pull cars over if you looked “hippie like” and look for signs of weed being brought to the show. We were a bit late as a result of the traffic slowdown and walked in with the ACLU looking for anyone stopped to initiate a class action lawsuit against the town… Allman Brothers were just starting In Memory of Elizabeth Reed and those two drummers were on opposite sides of the stage…we just ran in and enjoyed the concert..always incredible stuff. My wife got me a t-shirt “old enough to see all of the great bands”
Got the tinnitus to prove it

…. Actually this high frequency whistle really does suck
EDIT: This brought back a few things.. I saw Cream at a high school auditorium about 1967 for $3.00 I was probably 14. Saw Ten Years After in 1968 in Miami …also $3.00 at a place called “ Thee Image”. It was a converted bowling alley with day-glo all over the place…maybe 150 people and the big winner…The Doors at Dinner Key Auditorium in 1969…the infamous concert where Jim Morrison cursed at the crowed and the cops raided the show in the middle of Touch Me. Something I’ll never forget. That action spawned the decency in music rally with Jackie Gleason and Anita Bryant at the Orange Bowl. I was there too