You mentioned Glasto. A few moments come to mind.

Billy Gibbons coming on to play with Ronnie Spector for Be My Baby

Bruce playing overtime and getting Michael Eavis fined

Best of all.... getting to see Patti Smith from backstage..... which was brilliant in itself. But then we spotted the Dalai Lama in the other wing. Watching the crowd as he walked on, and them slowly realising what was happening, was awesome . After his "set", he turned and blessed us . And then Patti restarted her own set.... 5 minutes after singing Happy Birthday to DL, she's up at the mike screaming "I am a ****ing animal!"