“The ordinance as it stands requires independent promoters to apply for a license at a cost between $500 and $2,000 every two years, submit to fingerprinting and a criminal background check, secure as much as $300,000 in liability insurance and be at least 21 years old. These requirements add an additional layer of bureaucracy and expense on promoters who are working at venues that have already met Chicago’s insurance and licensing requirements, which are some of the most stringent in the United States.”