(This being a children's book author's blog, I'm assuming "a**" stands for "arm," or maybe "abs"; or perhaps it's an esoteric reference to plot development: "write your arc off." I'll leave it to you to decide).
I have to admit, I have a certain knee-jerk disdain for arbitrarily-declared writing effort events, which is why I was tempted to post this summary of my participation in last week's National Picture Book Writing Week...
(...but that would have been smart-alecky, so of course I refrained.)
Nonetheless, I'm well aware that the #1 rule of writing is "Honor Thy Process." And sometimes an arbitrary writing event can be just the inspiration needed to kick your writing back into gear.
So this Saturday, I encourage any of you who are writers to write earnestly, creatively, and with abandon, for as much of the day as you can.
In short: Write your asterisks off!