I plan Christmas all year.
I booked our cottage a month ago - as there are very few available near both our families. (DF was on to me on Monday night to tell me how fabulous it is - I think he will spend more time than usual with us this year!).
I talked to DD last week, as it happens, about whether she wants to do the Santa Train this year (we have tended to do it every 2nd year and this would be the year) - it books up in July. But she said no so I can skip that.
Some years I am well started on my craft projects for presents, as I have lots to give to - but this year is going to be a more "shop bought" year. I have got a few things though (I have over 50 to buy for). It's partly budgeting and partly trying to find nice things that they would like individually.
I have mince meat maturing - the longer the better for that.
I need to plan ahead for busy work season and also to be able to enjoy the festive season, not spend it racing around completely stressed out.
I think about some aspects of relationships a lot, so that I can manage expectations and be prepared when things go the same way as always - I can't change others but I can change how I will react to them. But that needs to be thought abut in peace, calm and quiet over a long period of time to identify the issues and see what can be done differently to have a different outcome.
And above all, I try to live with the spirit of Christmas in my heart all year long - it is about a season of goodwill to all, and why shouldn't that be a long season?