A preliminary certificate of authority is not valid after one year from its date or after such further period, not exceeding one year, as may be authorized by the director upon cause shown, unless the 500 applicants hereinafter required have been secured and the organization has been completed as herein provided. The articles of incorporation and all other proceedings thereunder shall become null and void in one year from the date of the preliminary certificate of authority, or at the expiration of the extended period, unless the domestic society has completed its organization and received a certificate of authority to do business as hereinafter provided.