To obtain authorization to book a location in the Duomo and Castello areas, you need to upload to your profile, in the section dedicated to the Municipality of Milan accessible from the Profile area and scrolling down to the checkbox for the city of Milan, a YouTube link to a video filmed outdoors in street attire with a recommended duration of not less than 2 minutes. Essentially, you need to show the Municipality of Milan the type of setup you use for street performances, in order to receive authorization.  Once this video is uploaded, you await authorization from the Municipality of Milan, which can arrive in a few days. If you do not receive this authorization within a few days, you can write for further support to artistidistrada@comune.milano.it