Years ago, I lived and performed in London, England for a while.
One of the best venues for "al Fresco" music at that time was the courtyard at Covent Garden - a spot with auditions and a schedule, not unlike the current situation at San Francisco's Del Monte Square.
A popular act there was a group of 5 Chinese musicians, playing traditional Chinese instruments. They always seemed to be on the schedule - I mean nearly every day. Often written in as a substitute, but - much more often than anyone else.
I found out why. One day, after my set, a LARGE west indian fellow came up to me, and handed me 25 quid, and told me that the Chinese Musicians were buying my next date - and that I was not to come back after that. His manner was grave, and serious. I looked him in the eye, and he had trouble meeting mine. I asked him "Is this what it sounds like?" and he informed me that I did, indeed, have the right idea, and that he hoped we could avoid any physical unpleasantness.
Over a Busking Pitch!
I laughed at him, told him fine, just fine, no problem, and to report back to his "employers " that I wouldn't show up at Covent Garden any more - but that if they ever had a chance to travel to America, they'd better avoid Philly. He laughed, actually relieved, and said that he would tender my message and my fondest regards.