Shoebox, wrapped in Christmas paper (lid wrapped separately), under the tree containing: Scissors, screwdriver, spare batteries, sellotape, spare bulbs for lights, a spare rubbish bag folded up etc. All ready and easy to find in case of emergencies.
I peel all veggies and potatoes on Christmas Eve. Potatoes are soaking in water in their pots on the stove. Carrots in batons in a plastic tub in water. Brussels sprouts and parsnips in separate tubs with no water.
DH makes the stuffing the day before, as it's a family special sausage meat one (that he has to ring his DM, without fail, every year to check the details of how to cook it).
Make sure all bins are emptied in the final collections before Christmas - whether they need it or not. (We pay by weight and per lift here, with landfill bin one week, and the recycling and composting bins both on the alternate week in every fortnight).
I fill the coal bucket on Christmas Eve. I used to set the fire ready to light in the morning, but last year, we lit the stove on Christmas Eve (DD watches The Santa Clause, so didn't seem concerned as Santa is able to make the fire go out in the movie - we reckon she has stopped believing a few years back but won't admit it to us!). But having the bucket full, and having emptied out the ashes on Christmas Eve, means it is fast to set up on Christmas Morning (we only need to empty ashes every few days mostly).
I also leave out our good outfits all ready to go, including my jewellery and makeup, ready to slap on in the morning after stockings and before rushing out to church. I also leave the kitchen ready as I go to bed on Christmas Eve, so that when DD drags us down at stupid o'clock, I can flick the switch on the kettle for a fast coffee to help bleary eyes while she shrieks with excitement!! And we leave a tin of jus-rol croissants in the fridge ready to roll out, with a tray on the counter, to get a fast but treat breakfast on the go. (Most years, I think I will squeeze orange and grapefruit juice fresh, but I am coming to the realization that I won't, and the past few years have also bought a bottle of fresh squeezed on Christmas Eve, which is very welcome!!).
We don't need to worry about setting table or huge preps as we are only 3 when we are at home, so setting the table after presents is no hassle. But I do need to remind myself to have a nice bottle of white wine in the fridge the day before.