The New York Times receives between 200,000-300,000 API calls on the ordinary day, coming from more than 200 developers. Every day is hack day for our developer community. But this Hack Day, the one we host each year, is special. It’s when we open our doors and get to mash up stuff together. The great thing: who knows what somebody will make, or what’s going happen.

Registration is open for the 2011 TimesOpen Hack Day. Confirmed API partners include: Foursquare, Facebook, Tumblr, Twilio, Etsy, with more to come. There is no cost to attend.

The event will begin early (10 a.m.) on Saturday, December 3, and go late (midnight or thereabouts). In between, developers will get to mashup NYT and partner APIs. There’ll be breakouts for deep dives into the inner working of our (and partner) APIs. We’ll provide food, beer, prizes and a stimulating, supportive, creative environment.

New York Times developers will be there to answer questions. We’ll also have experts on hand from our API partners.

We’re excited to host our developer community and see what you build. Hack, deploy, code, break, fail, triumph — we can’t wait to see what you create.

It all takes place at the Times Building, 15th Floor, located at 620 Eighth Avenue (Eighth Avenue at 41st Street), starting at 10 a.m. on December 3.