The association is obligated to conduct parimutuel racing, except in the case of emergencies, on each race date allocated. The commission must approve any change in race dates. In the case of emergencies the stewards may authorize cancellation of all or a portion of any race day. The executive secretary may temporarily approve changes in the conditions of the race meet including, but not limited to, post time and additional days pending final approval of the commission at the next regularly scheduled meeting.