Its official, the winter bash starts on December 19, 2016 and runs up till January 8, 2017.
I for one am super excited (again).
However my question to all of you is, do you want BSE to not have hats?
To quote the email from SE:
If you want in, you don't need to do anything; that's the default this year, due to overwhelming positive response in previous years. If you want to opt out, have someone on your team reply to this e-mail to say so by Tuesday, 13 December 2016.