Christmas decorations go up 1st weekend of December.
Advent calendars (choc & toy) are given on 1st Dec.
We make various crafts over the Dec weekends. Foam Christmas trees, paper chains, Christmas cards, paints polystyrene shapes etc.
Mid Dec (my birthday) we go to a nearby town & look at their lights - amazing displays!! Come home & have hot choc before bed.
Thinking of taking them late night shopping this year which we've never done.
Christmas Eve we take the dogs to the beach & take flasks of hot chocolate (water & treats for the dogs :) ) When we get home (mid/late afternoon) I go & run the bath & ask the dc to get some pjs out where they discover & wrapped gift on their beds containing Pjs & bath bomb. Some choc coins scattered that Father Christmas must have dropped!
When dc in bed after lots of excitement & stories we chill out with a cup of tea & biscuits & watch National Lampoons Christmas Vacation 
Christmas morning stockings opened upstairs, sometimes on our bed but I remember the excitement of waking up & opening presents on my own in bed & loved it so they don't have to come in straight away. We usually wake up hearing excited chattering & then someone will rush in! Love it!
Then either DH or I will go downstairs to let the dogs out & make a cuppa & the other will make sure dc all go to the toilet etc then come down & let the chaos comence!
GP, MIL, and DSis usually come round mid morning & stay a couple of hours (they each have a few of us to fit in) I must admit I love seeing them but feel more relaxed when I know visitors have been & gone.
I cook a roast, dh helps with prep & then assembles toys etc & adult DSS plays all the dreadful games - pie face anyone?
while I cook/hide in the kitchen.
Bedtime whenever but not too late - relax!!!
Boxing Day - relax!