I'm feeling nostalgic. So here's a story from long, long ago:
This happened at a Philcon, back in the day. The hotel had a surprisingly large restaurant and a wandering accordion player who roved from table to table, playing snatches of music while people tried to to avoid eye contact. This was back when Cyberpunk roamed the earth and science fiction had some claim to being cool, remember. And no amount of Postmodern irony could make accordions cool.
Weaving his way between tables, as if by Brownian motion, the musician grew closer and closer. Everybody at my table got tenser and tenser. At last, he arrived and asked if we had any requests.
"Yes, I do," I said. I handed the man a twenty dollar bill and pointed to a table at the far end of the room, where Gardner Dozois was hobnobbing with the movers and shakers of the field. "I want you to go over to my friend at that table and play Lady of Spain."
The rest of my lunch was spent very pleasantly, watching Gardner try to josh, flatter, and cajole the accordionist into moving on somewhere else while the musician manfully and enthusiastically earned what was surely his best tip of the day.