If you could, what live performances would you enjoy re-living?

The one is easy. Girlfriend and I had a front row seat to a 5th Dimension concert. As they are setting up, one of them runs off the staging area rather quickly.
A few minutes later, he comes back but soon runs off again. There is a look of concern now with the stage crew and I overhear a conversation that claims the guy running off and on the stage has the pukes real bad.
It is one of their trumpet players. At the time I was also a professional trumpet player.
I hear one of them say "we need a trumpet player pronto call so and so" The other guy says "he will never get here in time for this show". That’s when I said , "I play trumpet". they both looked at me and said, "can you read" meaning could I read music. I said "I sure can". I always carried one of my trumpets and an array of Vinny Bachs in the car so I went to get it. They took me in back and gave me a rift to play that was in the song "Aquarius".
It was easy. they gave me another. That was easy as well. "Your on kid" was the next sentence.
So for the evening, I sat in as trumpet for the 5th Dimension and it was the time of my life.
At the end of the evening, they asked for my phone number saying if I was available for any swing of theirs in the North East would I come. I said yes.
I never heard from them again. I guess that was my "15 minutes".

@arro222 now that is a great story.  Your "15 minutes" is a life-long keeper.  I hope you enjoy that memory for many years to come.
And just for fun sake, 222 is my lucky number.  It was my dorm room number at college, too.

Lucinda Williams and Gurf Morlix at Maxwell's in Hoboken. Two guitars, 20 people in the audience. Remember it like it was yesterday. Whiskeytown at Mercury Lounge in 1997. Just making a name for themselves. Put on a great show. Easy to see Ryan Adam's talent and where it would take him musically. Lindsay String Quartet at Richardson Auditorium in Princeton. They used to do a free afternoon concert series back in the day. Tremendous acoustics and architectural space. Close your eyes and melt away. Also saw St. Lawrence String Quartet at the Frick Museum. Really intimate venue with great acoustics. Patty Griffin touring her debut album at the Turning Point in Piermont NY. Just her and her guitar belting out the entire album for about 30 people.

I am 65 years old and live in Vancouver, Canada.
There are a lot of concerts I would love to revisit, but these few would be magical.
Elton John’s first tour in April 1971 playing the Agrodome. A stripped down stage show before all the flamboyance.

Pink Floyd’s Dark Side of the Moon Tour September 30, 1972 in the PNE Gardens. The Gardens was the perfect venue for concerts with a capacity of perhaps 1,500.
Bruce Springsteen’s first visit to Vancouver on June 26, 1978 for the Darkness Tour. 3 1/2 hours of the Bruce and the Band is still the gold standard for me.

Tom Petty & The Heartbreakers first tour when he played the Commodore Ballroom on June 15, 1978. The Ballroom is a large bar with a spring-loaded dance floor that suited Tom to a tee.

Based upon great musicians in uniquely wonderful performances:

1.  Louie Armstrong and the All Stars, Michigan Theater, Lansing, 1951 or 2, I was very young and still amazed my parents took me!

2.  Miles Davis Quartet with Coltrane, Minor Key, Detroit, 1961.

3.  Mahavishnu Orchestra, Funky Quarters, San Diego, c. 1972.

4.  Nitty Gritty Dirt Band, Del Mar Fairgrounds, Del Mar, 1986.

5.  Mendelssohn Octet, Mostly Mozart Festival Balboa Park, San Diego, 1990.

There have been many other great concerts of course.  But these, other than Armstrong, stand out because the musicians seemed to be in a special groove for these performances, they were electric!  Louie was exceptional since that was my first concert, he was dad's favorite musician, and I still remember is as an outstanding experience.