For me it’s NaNo(re)WriMo.
I have a little logbook.
I have an eighty thousand word manuscript to use as a starting point.
And I have many-pages-long document full of notes from a Very Sharp Editor. These notes cut deep, and I found them to be very frightening for a long time. The notes (very rightly) pointed out some problems with the narrative that were just so dreadful I would just sink into humiliation at the thought of opening the manuscript. I wanted to just pretend the book didn’t exist.
But it did exist. It does exist.
I have a little blue drugstore notebook that Denver bought me when I was visiting. I’ve used it to re-outline the whole story, longhand, bird by bird.