Panto
Christmas markets (ds1-6 loved it last year)
Winter walks with flask of hot chocolate looking for fir cones to glitter up as decorations and sprigs of holly to put around the house
Lights, decs, trees up
Letter to Santa and reply via nspcc letter
Evening walks to look at decorations/trees
We put food out for birds an squirrels in December too. Ds loves that
Writing cards-or stamping them with kids Christmas stamps
We have a big bowl in the hall with a few baubles and loads of chocs like coins, quality street etc for visitors to help themselves. Ds1 has taken to keeping this topped up as quite a big Christmas responsibility 
Make reindeer food and put it out Xmas eve
Ds1 likes to plan in advance what snack Santa and reindeer will be eating and I take him out to buy it
Ds loves doing a stocking for the cat and dog
Choosing a few naice decs for kids tree and bedrooms
Making Xmas pics with glitter, sequins, cotton wool, arty packs. Ds will use the pics instead of giving cards out