Hi, welcome to Squat The Planet!
I'm not saying that your intentions are bad, but if you show up to an online community and your very first post is asking for information about anarchist groups, a lot of people are going to be very wary of you due to the nature of radical politics. It'd help if you posted an introduction about who you are, your background in traveling, etc. You get back what you put in.
In the meantime, a quick Google search shows a couple
Food Not Bombs groups in NYC,
an arts collective, and
a bookstore. Good luck!