Hi there!!
You should check out the regional forums here on Yorkie Talk -- a bunch of folks from NYC are on there pretty regularly. Oh, and definitely check out the Yorkie meetup group. We went to our first one a couple of weeks ago at the Chelsea dog run and our baby LOVED it!!! There's one every month so you should definitely attend!!
NYC Yorkie Meetup group:
http://yorkie.meetup.com/1/
Hope to see you there,
Mojito & Irmi