The department may appoint official inspectors at least one of which, in the absence of a member of the department, shall be present at any event held under the provisions of this chapter. Such inspectors shall carry a card signed by the director evidencing their authority. It shall be their duty to see that all rules of the department and the provisions of this chapter are strictly complied with and to be present at the accounting of the gross receipts of any event, and such inspector is authorized to receive from the licensee conducting the event the statement of receipts herein provided for and to immediately transmit such reports to the department. Each inspector shall receive a fee and travel expenses from the promoter to be set by the director for each event officially attended.