It has not yet been decided. For now I'm the only one leading this collaboration. There is hoping ponerpics representatives will join the trend and make this event legit. If it happends, they will sure set the date among other things. If not, I will continue coordinating the event alone and make decisions that most of the contributors agree on.
With that said, each and every one of you can vouch for a deadline date and we'll choose it accordingly. I think sometime in the middle of february will be fine.