N.Y. Comp. Codes R. & Regs. tit. 19 § 210.16
In the event of rain or other inclement weather occurring immediately before or during the course of any outdoor contest or exhibition, except during the course of the main event or a co-main event, the promoter may postpone the card with the approval of the Commission to such time and at such place as is approved by the Commission. An announcement giving the full details of the postponement shall forthwith be made by the promoter, and any patron desiring a refund of the purchase price of his or her ticket may apply for and shall receive the same at the box office of the promoter on the premises, except when the main bout or co-main bout is held on a rain-out date indicated on the ticket. All contestants who have fulfilled their contracts before the advent of the inclement weather shall be paid in full, and on the postponed date, substitute bouts in such number and of such duration as are approved by the Commission shall be provided by the promoter.
N.Y. Comp. Codes R. & Regs. Tit. 19 § 210.16