The written warning shall state that if police department personnel are required to return to the location of the event within the following twenty-four-hour period and the responding personnel determine that the subsequent event is a threat to the public peace, health, safety or general welfare, each such response shall constitute the provision of special security services. The warning shall state that the person receiving the warning shall be charged for the cost of the city providing such special security services for the event. (Ord. 1163 § 1 (part), 1990)