Making coloured paper chains in class. Having them hanging in big loops across the classroom. I made a little candle holder with holly in a small foil dish, I loved that thing! (Can't think why I was so attached to it looking back...) It was so nice to make festive things. And also, the time between Christmases was definitely longer than a year 
Seeing Christmas trees start appearing in houses in the front windows.
Sitting curled up in an armchair staring at our Christmas tree until I was in a trace-like state. All those sparkles... It was 7 feet 2 inches, white and silver, and looked the best tree ever. My mum bought the best tree she could find, as our dad was in hospital and she wanted to treat us. It was £2 3s 2d from Woolworth's. (It's still in our loft, even DH can't bring himself to dump it!)
Doing crafts, like making present tags, from old Christmas cards. I remember cutting out a picture of a girl looking out a bus window with pinking shears and using a hole punch in the corner. I can still see it so vividly after 35 years...
The decorations that used to hang from the ceiling over our assembly hall. I thought they were magical.
Getting a turn at opening a door on the advent calendar, genuinely a little excited at what the picture was going to be.
Our elderly neighbour always used to give us each a box of Thornton's toffees for Christmas. He was a lovely, kindly man and we adored and trusted him.