National Novel Writing Month (NaNoWriMo) happens every November. It is a challenge to set out and write 50,000 words during the month of November. It doesn't have to be a novel, nor a finished plot, nor even good – if you write the words, you're a winner. And if you don't, well, then you at least wrote a lot more than you would have otherwise!
You can read more about NaNoWriMo here: https://nanowrimo.org/