Great topic!! One of my favorite live performances is Chicago playing 25 or 6 to 4 in Tanglewood (Ma).
http://https://youtu.be/7uAUoz7jimg
Another one is Jimi Hendrix doing Voodoo Child in Maui in front of about 200 people. Check out the chick @ 4:00 into the video. She wasn't on the same planet as everyone else who was there.
https://youtu.be/qFfnlYbFEiE