N.Y. Comp. Codes R. & Regs. tit. 19 § 210.15
Changes in the announced or advertised programs for any main bout contest shall be filed with and approved by the Commission at least 48 hours before the weighing-in time of the contest, unless otherwise directed or authorized by the Commission. Notices of such change or substitution shall also be included in any public announcement or advertisement relating to the card, and shall be conspicuously posted at all box offices on the premises and announced from the ring before the opening bout. If any of the patrons apply for refunds on tickets already purchased, the promoters shall make such refunds upon demand, provided such tickets are presented at the box office on the date of the program and before the commencement of the second bout or the main bout, whichever comes first.
N.Y. Comp. Codes R. & Regs. Tit. 19 § 210.15