National Novel Writing Month is when folks across the world settle down in front of their laptops to write 50,000 original words in a coherent story between midnight on November 1 and the end of November 30. It was founded in 1999 by Bay Area fellow Chris Baty, who did it with 21 of his friends. In 2000 the website was born, and it really started to take off in 2001. Now it's frigging huge.
Jennifer Rutherford is apparently the longest-running NaNo'er in the region, having done it consistently since 2001.
The region for the Sacramento/Northern California (but not quite Bay Area) forum goes strong around here every year. During the month of November, the Davis writers hold various write-ins at restaurants/coffeehouses in the downtown area. You can also head off to ones in Sacramento and other towns, should you be so inclined. Events being held in the area can be found on the forums, or at sacnano.org.
Davis write-ins for 2009 are currently being held:
(a) Sundays at 2 p.m. at Cloud Forest Cafe
(b) Wednesdays at 6 p.m. at Crepeville
(c) Fridays at 6 p.m. at 3rd and U Cafe
Look around for people sitting in a group with laptops, possibly with a NaNoWriMo sign on the table.