We just returned from WDW 6/18.
There are performers in each country that do various acts in the streets (singers, comedians, acrobats, etc.) They appear at various times throughout the day and evening and do their things right in the walkways (usually, but sometimes in some of the buildings if the weather is bad). I think they want it to seem random and spontanious, as if the people of the "village" are just doing their everyday routines.
However, there IS a very specific schedule of entertainers, and that is the key to WS in my opinion. It is not printed on the big, colorful EPCOT map they pass out at the entrance and the shops. It is a white piece of heavy paper with one color writing on it, like blue. It lists every street performer and spontaneous show in each country and the times. The schedules are different almost everyday, so be sure you have a current one.
My favorite is the Chinese acrobats.
Hope that helps. karen