If it's a weekday, I generally have to go in for the morning in the office. But we don't really do any work and DD comes with me. DH used to be off and come into the city with us and have coffee in town while I was at work, and then we'd meet to buy DD's birthday cake in M&S and any other last minute things we needed before getting lunch and heading home. But his company changed it last year to Christmas Eve being a working day. (Our office officially closes at lunchtime and we can leave realistically anytime after about 11 once we have shown up - his officially closes at 5 but the bosses tell everyone to leave at lunch - in both cases, you need to take a full day's leave if you don't go in).
After that, it depends on whether we are staying home or travelling. (If travelling, we might have already left but it's not unknown for us to drive to the other end of the country on Christmas Eve after work). If travelling, it's a round of both our DPs houses and keeping everyone else happy, before finding our cottage and hunkering down for a sleep (the rest of the year we stay with family, but for Christmas we find we need some space to retreat to separately).
If we are staying at home, we get home from town (and if it's a weekend, we probably go in anyway for lunch), and tidy up. We generally try to get a walk in the local hilly park or on the pier. DH and I prep for the turkey dinner (peel potatoes and veg, make the stuffing, make stock if I have a turkey neck, probably throw together a batch of mince pies) while DD makes cookies for Santa (she's 11 and now helps a bit with prep too, cookies may be made from scratch or sliced from a log of frozen dough depending on time available and energy levels). We may also have things to prep for 26th (DD's birthday and our annual "at home" for friends and neighbours), and we do things like clean out and set the fire for when we get home on 25th (lots of visits to do in the morning and early afternoon). Sometimes there are some presents to wrap or get out from cupboards.
There's usually either a Christmas movie on tv or music playing as we do all this.
Dinner is usually a buffet type meal of cured meats, seafood, cheese, salad-y bits, crackers etc.
After we have tidied up, DD (as the youngest in the house) lights the Christmas candle and we have a little period of quiet as we remember the good and bad things about the year just gone, people who are no longer with us, people who are away or that we won't see, and the Christmas season itself, and say a few prayers together.
Then we get out the Christams Eve box, which holds new PJs for all 3 of us, a posh hot choc (lump of choc on a wooden spoon to melt), a seasonal lush bath each for DD and I, and old favourites such as DD's plastic Christmas plate and glass for Santa's snack, her stocking, and the family copy of "Twas the night before Christmas" for her bedtime story.
DD puts out the snack for Santa and her stocking, then heads up for her bath and new pjs, comes back down for her hot choc and we snuggle her up in bed with the story and maybe read her another (rare treat these days, but we do still read to her sometimes in bed), before leaving her with an audio book to go to sleep.
Then DH and I relax for a while, (I may take a bath or leave that for another night), we have our own hot choc (which may be laced with something alcoholic), and head for bed before Santa comes down the chimney. We don't set the table or anything, but we do leave things ready for a nice breakfast and nice clothes out for doing the visiting etc in the morning so we don't need to rush too much.