For our more Northern wrimo's, note that the Bloomingdale Library is hosting write-ins on November 18th and 20th. (Check the Google calendar for details.)
Here's what they sent about it:
Well provide the snacks, space, and electricity; you bring your computer and your enthusiasm! The library is opening the large meeting room up for all Wrimos (writers that are participating in NaNoWriMo) to spread out, have a snack, and get to work meeting that 50,000 word target! If you need dedicated time to work on your novel take advantage of these uninterrupted writing sessions.