Question about busking in Denver

[Irina]

Can anybody update me on current busking situation in Denver? I was there more then 10 years ago, got a busking permit in the City Hall (I do not remember if it was free or not, but it was easy to get), but it was a heat wave so I did not work at all...I am planning to stay in Denver for 20 days in june 2015, and I see several festivals listed on weekends on festivals.net - I wonder if busking permit is enough to work at festivals or shall I rent vending space for face-painting? How is Denver in june? Thanks!