I used to live in Tripoli, Libya. On our way back to the USA, we stayed a couple days in London. As our taxi neared the hotel, I saw a venue only 2 blocks away "DAVID BOWIE TONIGHT!" I asked my parents if I could go, and they said sure. It was the last show of his Ziggy Stardust tour, and he came out on stage with a big gold sun with lightning bolt across it on his forehead, fishnet stockings, a gold lame one-piece, with plastic hands reaching around from the back to grab his chest. Many/most of the attendees were dressed similarly. It was an eye opener. Mick Ronson was amazing, but really, the whole show was. Supposedly, Boy George, Sid Vicious, Johnny Rotten, Johnny Marr, Polly Styrene, and many other of the soon-to-be punk explosion were there, too.
Just a month after that, back in Portland, I saw Elton John at the Portland Coliseum, my first show in the USA. Although he hadn't released Goodbye Yellow Brick Road yet, he played many of the songs from that album. Bad Company opened for them. I smelled my first weed, as a couple in the seats just in front sat down, opened a small cardboard box, proceeded to roll, then smoke, about a half dozen joints during the course of the show. Wildly different crowd, far more tame than at Bowie. (Edit: Nope, it was Sutherland Brothers and Quiver who opened for Elton John. Bad Company opened for Rare Earth, seen shortly after that).