Winterbash 2014 is on its way. It will run from 15 December 2014 to 4 January 2015.
For those who are unfamiliar with the Winterbash hat dash, it is a time of festive fun and hats. Each person can earn hats. The criteria for each hat is available at the above site, although some criteria are secret. If you earn a hat you can put it on your avatar (only one at a time). To see the sort of hats which have been available in the past, have a look at last year's site.
As with last year, if you don't want hats you can opt out.
There is also the possibility of the whole site opting out before it starts. Nobody wants that, though, right?