NaNoWriMo is during the month of November, through the entire month people far and wide challenge themselves to write I believe 50,000 words of a novel. It's quite the challenge but a rewarding experience, though the writing itself doesn't turn out very good.
I hope that answers your question.
If you have anymore questions you can PM anytime.
Kamas
"Nothing is permanent in this wicked world - not even our troubles." ~ Charles Chaplin
'This must be Thursday,' said Arthur to himself, sinking low over his beer. 'I never could get the hang of Thursdays.' — Douglas Adams, The Hitchhiker's Guide to the Galaxy