100 Days of Code - December 31st might be a good deadline, so the actual challenge could be started with the New Year.
Also, start the repo for the new js13kGames website and move things forward. Time flies, and we need to have it functional for next year as soon as possible.
There’s also a chance to do some planning for the Gamedev.js meetups in Warsaw. This year’s rather too late, but the end of January next year seems like the perfect time for a new beginning.