After making such order the division shall hold a public hearing or hearings at which an opportunity to be heard shall be afforded to any employer, or representative of employers, and any industrial homeworker, or representative of industrial homeworkers, and any other person having an interest in the subject matter of the hearing. A public notice of each hearing shall be given at least 30 days before the hearing is held and in such manner as may be determined by the division. The division shall send written notice of the hearing to every business and employer which the division believes may be adversely affected by the order. The hearing or hearings shall be in such place or places as the division deems most convenient to the employers and industrial homeworkers to be affected by the order.