Yes you can make gravy a day ahead. There are several recipes you can google how to do. We add the drippings from the bird/ minus some of the fat to the already made gravy. Gives it a good flavor boost.
Yes you can make stuffing ahead. Put it in a crock pot ( or borrow one if you don't already have). It will get heated up and stay moist.
One of the things we found, as a 'speriment, was you can also make mash potatoes a day ahead. Peeling 10 or more pounds potatoes is a big job. I didn't make em so I don't know what was put in them, besides the potatoes, butter and milk or cream. Some people put sour creeam or even cream cheese. I am pretty sure these just were made simple, no frills. The DxW put these in a crock pot /fit the liner in the frig overnight, and then just warmed them up in the crockpot the day of. They too turned out hot and just right.
Make lots of gravy. And enjoy your weekend !