Here is a good legal background on street vending in Vegas... also, I recently saw a cop on the strip tell a busker that they 1) couldn't have a sign asking for something (have to get rid of signs asking/begging) and had to 2) keep playing... if you are playing and not an obstruction you should be okay, but no signs.

here is the link to the opinion:
http://www.ca9.uscourts.gov/datastore/opinions/2006/10/19/0515667.pdf


also, there is a current debate in the city government about a regulation to ban animals on the sidewalks except for the regular exceptions (service and local residents of a small block raidus) because of the habit of beggars/panhandlers to use animals to increase profits. worth knowing.