not sure who you are interested in- but you probably gives you more choices of porn stars than any other city other thank LA-  if there is someone in particular you are interested in e-mail or pm the major agencies here and they can probably get something set up if there is enough interest

New York has a LOT of porn stars touring here.  This month TLC (one of the major agencies) has:
Eden Adams, Alexis Adams, Layla Price, Stacy Jay and Natalia Star in NYC and available for bookings.  TLC has ladies touring about every 2-3 months.  And they are just one agency.  Other agencies, such as ExclusiveModelIntroductions has several ladies listed every week.  There are at least 3 other agencies that I know of that have ladies touring NYC.  Finally, if you check various ad sites (that I can't name here but one of them uses the name of the Greek god of love), you'll find even more.

So, either you're not looking around, or the ladies you're interested in don't tour.  But, I'll bet if you contacted an agency like TLC, you'd get more information and also let them know that there's interest in those ladies being in NYC.  If there's enough interest for those particular ladies, they can often be convinced to tour (but not always).  

If you really want to see a lady that doesn't normally tour, you can also possibly arrange through an agency to bring her out to NYC if you pay plane fare, hotel room and book an overnight.  But, that takes a lot of money.  Personally, I don't recommend it unless you've seen her before because if you don't get along you've paid a lot of money for nothing.  But, that's up to you, your wallet and your little head. :-