But, controversialD, we are to be 'in the world, but not of the world.'
What if God wants you in the world , going to parties, not to hoopla the food and presents but to reach others to Christ. You mentioned the Holy Spirit does that work and doesn't need a holiday to work. True. He doesn't need anything, He can work despite us.
But, what if the HS is working during the holiday in you but you are choosing not to work. Is it an uncomfortable feeling for you is my question? Maybe, it's a social issue for you and not a spiritual one, because all you say just reeks of legalism.
By spending money and giving gifts to friends, especially those who are not Christians, this is an example of Love and doesn't it say in God's holy, inspired words that "of faith, hope, and, love, the greatest is love.'