2021 New York Laws
GBS - General Business
Article 41 - Combative Sports
1002 - Combative Sports Prohibited.

§  1002.  Combative  sports  prohibited.  1.  The conduct of combative
  sports outside the  supervision  of  the  commission  or  an  authorized
  sanctioning entity is prohibited.
2.  A  person advances a prohibited combative sport when, acting other
  than as a spectator, he or she engages in conduct which materially  aids
  any  unauthorized  combative  sport.  Such  conduct  includes but is not
  limited to  conduct  directed  toward  the  creation,  establishment  or
  performance  of  a prohibited combative sport, toward the acquisition or
  maintenance of premises, paraphernalia, equipment or apparatus therefor,
  toward  the  solicitation  or  inducement  of  persons  to   attend   or
  participate  therein,  toward  the  actual  conduct  of  the performance
  thereof, toward the arrangement of any of its financial  or  promotional
  phases,  or  toward any other phase of a prohibited combative sport. One
  advances  a  prohibited  combative  sport   when,   having   substantial
  proprietary or other authoritative control over premises being used with
  his or her knowledge for purposes of a prohibited combative sport, he or
  she  permits such to occur or continue or makes no effort to prevent its
  occurrence or continuation.
3. A person profits from a prohibited combative sport when he  or  she
  accepts  or  receives money or other property with intent to participate
  in the proceeds of a prohibited  combative  sport,  or  pursuant  to  an
  agreement   or   understanding   with  any  person  whereby  he  or  she
  participates or is to  participate  in  the  proceeds  of  a  prohibited
  combative sport.