I saw this mentioned in a comic strip: "Busking."
Wikipedia tells me:
Busking is the practice of performing in public places to receive donations of money. Performers may play music, juggle, perform mime, do magic tricks or a comedy act, or simply stand still as statues (very popular in Europe currently). Those engaging in this practice are called buskers. In the United States, this term is not as widely known; buskers there are called street performers.