No such permit shall be granted by the corporate authorities until they shall have investigated the carnival and are satisfied that, if permitted, it will be operated in accordance with the permit and the provisions of this Division 54.1. Such corporate authorities may issue the permit and collect permit fees necessary to pay the expenses of the investigation and to aid in policing the grounds and otherwise to compensate the city, village or incorporated town in such amount as the corporate authorities may determine. Each permit shall contain the proviso that sheriffs and police officers shall have free access to the grounds and all booths, shows and concessions on such grounds at all times, and it shall be the duty of all officers present at such carnival to enforce all the provisions of this Division 54.1.