Every challenge is a 30-day program you run yourself, in the Room. Day one is the day you start, not the first of some calendar month. Late January, mid-July, tonight: your book, your clock. Nothing to sign up for, nothing to join.
Fifty thousand words in thirty days. Run it in November for old times’ sake, or any month of the year. Your clock, your target.
One prompt a day for 30 days. Write the opening you wish you'd read. No word target, no graveyard if you skip a day.
Name the draft you've been carrying and give it 30 days to reach an ending. Not glamorous, but it's the month your book gets finished.
A growing shelf of prompts for the days your page is blank: first lines, last lines, dialogue, settings. Use them in a program or on their own.