I think I've talked about this... My sister's in-laws had a long-standing tradition of a "gratitude journal". Every year on Thanksgiving, anyone who is together with them celebrating is expected to write in it, expressing what they're thankful for that year.
When I met my wife (2016), we started doing that as well. This will now be our 10th Thanksgiving together, so we've amassed 9 years of entries into the journal and will have our 10th tomorrow.
It's great fun, because each year you can look at the previous years, reminisce about the good times with whoever was there to celebrate, look over the years at how people (particularly kids) have changed and grown, etc... I recommend it for pretty much anyone, but especially for those of you who still have kids at home, or are into the stage of life where you're celebrating with your kids and their kids...
So I realize it's probably a little late in the game, but if you want to introduce a new tradition for whoever you're with tomorrow, there's still time to run out to a store and get a blank journal...