I don't think there is any organized activity already set up for you to walk into, where tickling is going to be happening. If you were into spanking, flogging, and a few other forms of the more hard-core stuff, you'd find a bonanza at the aforementioned Paddles. When it comes to New York, what you're looking for, if it's to be found at all, is going to come from getting to know the New York people. Now, there was just a New York munch yesterday, as I understand it, but you can still set up another one. Just pick a restaurant (which I can help you do), announce that you'll be there if others will, and see who responds. It may or may not lead to play--that may take a few more trips to swing--but you'd be meeting a few New York people, both men and women.
I've been saying right along, by the way, that New York's ticklers ought to do the same thing New York's spankers do: have a monthly, specially scheduled play party at Paddles preceded by a munch. Michael, the owner of Paddles, will be more than happy to talk with persons interested in setting this up. You just need--and here's the tricky part--to get enough of a critical mass to make it worth Michael's while to open the club three hours early (at 7 instead of 10). But nobody's shown signs of picking up the ball on this one. (My own days as an organizer of New York munches and such are pretty much behind me, but I go when I'm in town.)
Which Saturday are you going to be there?