It’s National Novel Writing Month, also known as NaNoWriMo. If you have writer’s block or trouble with an internal editor voice that interferes with your writing a first draft, this month-long activity can be a fun way to deal with it.
Participants are encouraged to write 50,000 words or more in one month.
Out of curiosity I went to the website to see if one can register after November 1st, and registration is open. So if you want to try it this year, you still can.