When September 11 happened, I was living in New York City, and like many other NYC residents -American or not- I was distressed.
Paul McCartney and Co. put together a concert to cheer us up (https://en.wikipedia.org/wiki/The_Concert_for_New_York_City), and that was the first time I had a chance to listen to Bowie live.
It turned out to be the last time. RIP.