For linguistics & cognitive science specifically:
Princeton CogSci Week
Ethnologue, Languages of the World
The Linguist List
Linguistic Society of America
AAAS Section Z: Linguistics and Language Science
Women in Linguistics Mentoring Alliance (WILMA)
For fun science events in the area:
Secret Science Club
Nerd Nite NYC
NYAS Science & the City
PPPL Science on Saturday
For other interesting food for thought:
Radiolab
3quarksdaily
Empirical Zeal