I celebrate Christmas by doing some sort of charity activity or charity work. This year, the holidays were too hectic to coordinate volunteering anywhere, so instead, I knit up a couple of dozen children's hats (I'm a very fast knitter, and I can whip them up while I watch Netflix) and gave them to my family members, along with a blank gift tag. They all wrote their names or nice little holiday messages on them, and they're all being sent this week to a charity which will distribute them to some kids who need them.
It's funny, it seems to me that many of the people I know who declare themselves to be deeply faith-driven (whether they be Jews, Christians, or anything else) seem to have, from my perspective, very commerce-driven holidays. The atheists I know (myself included) all seem to try to avoid the plastic aspects of the season. I'm sure there are many exceptions to that rule, but it holds true fairly often.
You all have some lovely holiday activities.