I have always advice people to plan their investment to cover for personal needs and also some other emergency needs such as a season like we have now. Through proper planning, there will be no need for the investor to sell bitcoin for this kind of holiday unless the investment was made separately for such and different from those kept for long term HODL. This is not bad in my opinion because there are people who save fiat for holidays and if someone can save fiat for holidays, then bitcoin can also be saved for the holidays.
When it is festive seasons like this we should have plans of how to make proper preparations before the season even comes when there is a good plan made then everything is made easy, and you can even make savings just for this season because there is no way that you won't celebrate when. Seasons like this come and spending without proper planning will just put you in another failed financial situation, and January is usually very hot especially when it comes to finance and things are usually very expensive.
Instead of having plan to sell your bitcoin it is better to just spend your fiat so that when people are busy selling and getting profits it will be better than just selling just because of season and it will pass so don't not waste too much time investing, and since it's something that you have to hold for a long time you don't have to worry too much, and if they can save fiat for the holiday then saving bitcoin will not be a bad idea also because if it eventually increases it is still at the persons advantage.