No gathering or entertainment described in § 132.40 shall be held or presented in any premises other than a building as described in such section, unless the premises have been examined by the Fire Marshal or Building Inspector not more than three days before the date of the gathering and found to be free from any fire hazard and found to be suitable for the purpose. No structure enclosed by a roof shall be used for that purpose unless it is constructed of non-flammable materials, provided that tents or structures covered by canvas or other material has been properly treated so as to be rendered fire resistive.
('73 Code, § 22-72)