Before my DM died, Christmas Eve always meant a wander round town together, shopping for ourselves in the early sales and going for lunch (then drinks as I got older). We'd go home to have a picky tea of cold meats, roasties, pickles, cheese, etc while playing trivial pursuit.
I'd then have a shower or bath before bed, and come out to a present on the bottom of my bed - always new pyjamas!
When I moved in with DH I would spend the morning & afternoon with my DM and then go to Christingle in the evening with him and his family (SIL is a vicar so we'd go to her service) then we'd go home to have M&S party food, some champagne and watch Christmas tv
Last year, DD was 6 days old so I'm pretty sure we just went for a walk round the village in the afternoon and ate my body weight in party food and chocolate while watching tv.
The traditions we want to have, as DD grows up, are:
• A family walk either at the beach or along the river or even just in our village
• Going to the Christingle service with all of the family
• New pyjamas on the bed on Christmas Eve
• Reading "the night before Christmas" in our bed with DD before she goes to bed