I buy the tape on the dispenser from Costco (Scotch tape. It has a regular and a gift tape) so I'll get some next time I'm there
A pair of good scissors (that I can hide away , scissors run away in our house)
We've already booked our Harry Potter tickets. (going near Christmas)
How flexible do you need to be with guests. Bear in mind, if people travel you need to allow for weather and seasonal illness (my Dad won't travel here at Christmas, he's worried about being snowed in
. Even though him and my Mum are retired, and the country doesn't really grind to a halt. It would be a matter of a few days)
YY to getting your online booking date booked as soon as they release them. I don't do online food but I'll go out mid Dec and buy all the store cupboard things , then my Big Shop about the 22nd.
I write all the meals out then what I need for each one, then do my list. (Sainsburys Nectar Points pay for my big shop)
We have a DH and I shopping trip on the last Friday in November. Shops are quieter, we can mooch round and go into shops that we wouldn't normally go to
Then we pick an evening or a Sunday to take the DC out (after I cash up the £2 jar)
Ooh yes, Christmas Linens
. They're washed before they're put away but they always get another wash with Fairy before they go on the beds.
I do my decorations by theme (like gold/red in the lounge. Silver/clear on the stairs) and change them round each year.
Decide on colour theme for table.
And we need snow . Folds arms and stamps foot.
We had snow the couple of years before (not on Christmas Day but around then). Last year I think I had to scrape my windscreen twice. 
Buy Christmas jumper 