Stack Exchange last year did an end of the year party featuring special hats. They want to know if we want to do the same thing this year to our site. So, do we want hats?
If our community decides to opt-in, they still provide an option for those opposed:
Individual users who don’t want to participate, don’t want to see hats, and/or are generally anti-hat will have an “I hate hats” option available.