It has been around for over 20 years and, at an estimated 10-20,000 participants has grown to one of the largest monthly urban participatory experiences in the world that has no central organizer.

It started as an artwalk mostly within the central business district and has geographically expanded to over 3.5 square miles, from a dozen spaces to over 100, including major cultural institutions such as Phoenix Art Museum, Arizona Science Center and the Childrens Museum.

It produces as much as $300,000 in user fees and up tp $1,000,000 in sales tax revenue each year, vastly outstripping any local grants funding its institutions receive for the 12 evening events.