An acquaintance of mine has started the "Bitsywick" game jam events. The first one is in late January 2015. A theme will be determined and announed, and participants have a week to come up with a game and submit it. This is a shorter form event than what he usually runs in August: The Buswick.

http://bitsy.thebuswick.com/2015/january/index.php

Folks around here seem accustomed to games completed in a week or less, so there's likely at least a few of you who want to participate.

I'll see you there! :)