I've noticed that there are a number of Christmas-related posts over at Triablogue (link to said posts). I admit I have not read the posts carefully (and some are just for fun), but I have not seen any advocating the idea that the church is permitted to make December 25 a holy day of obligation or arguing that God has requested that we honor Jesus' birth with a holiday. If Triablogue were to hold those positions, I would find it pressing to engage with their posts.
I trust that both non-Reformed and Reformed members of Triablogue would agree with me that no church has the right to impose on the conscience a duty to celebrate Christmas, and that God has nowhere indicated that he wishes to be worshiped by an annual feast of the nativity. Since we agree on those core principles, and since I am so busy with other things, I'm quite willing not to defend the Puritan position that I hold (because it's Biblical, not because it's Puritan).
In fact, I would not have even thought to mention their posts at all, had not one kind reader privately messaged me indicating that he believed Triablogue's posts were directed at me in some way (something I could not find in my quick perusal of the tagged Triablogue posts).
If the Triabloguers wish to keep the day to the Lord, let them do so.