Wis. Stat. § 444.03: Application for license; fee.

No professional contest or amateur unarmed combat sports contest may be conducted by any promoter or club except by license granted to it by the department. An application for a license shall be in writing, addressed to the department, and verified by the promoter or by an officer of the club. An application shall be accompanied by an annual fee of $500. The application must show that the promoter or club has entered into a valid agreement for the use of the building, amphitheater, or stadium in which contests are to be held.