Where could we all get coffee this evening at 8pm in NYC?

Ok, I arrive around 6pm in NYC tonight, so I can do a coffee at 8pm with anyone who's interested. Our hotel is near 3rd Avenue and E. 52d or so. So where's a good spot, relatively near there, where we could grab some coffee or a drink and have enough room for a decent number of folks (typically, between 30 and 50 people show up - you never know, but it's possible).

I need suggestions quick, since I have to leave for the train a bit after 2.

Thanks, JOHN