All users of the Corn Palace will provide proof of adequate crowd control and/or police protection as a condition of the use and occupancy thereof, unless other arrangements have been made through the Corn Palace Director. Adequate crowd control and/or police protection shall be stationed so as to have full control over all areas of the Corn Palace, both used and unused. Crowd control measures shall be implemented and maintained beginning no less than one-half hour prior to the use and opening of the Corn Palace and shall continue until all spectators and other persons have left the premises at the end of the usage.