The Council may authorize any holder of an on-sale liquor license issued by the city or by an adjacent municipality to sell liquor at any convention, banquet, conference, meeting or social affair conducted on the premises of a sports, convention or cultural facility owned by the city, or instrumentality thereof having independent policy-making and appropriating authority and located within the city. The licensee must be engaged to sell liquor at such an event by the person or organization permitted to use the premises, and may sell liquor only to persons attending the event. The licensee shall not sell liquor to any person attending or participating in any amateur athletic event. The sales may be limited to designated areas of the facility. All such sales shall be subject to all laws relating thereto. The licensee shall provide proof of the extension of financial responsibility coverage to the premises on which the sales are to be made.