If a boxing contest is held within the corporate limits of a city or town, the chief of police shall assign not less than one officer to attend the contest, and if a boxing contest is held outside the corporate limits of a city or town, the county sheriff shall assign not less than one of his deputies to attend. The officer or deputy shall be charged with the duty of preventing disturbances amounting to breach of the peace by spectators. The cost of providing such officer or deputy shall be paid by the promoter.