We do "platter" on Christmas Eve. Not always the same - depends on what we see and fancy, but generally a mixture of things from:
Set out the Christmas cheeses to get started on them.
Cured meats like parma ham, braseola, salamis.
Cooked meats like ordinary ham, maybe some proper corned beef.
Sliced smoked salmon, cooked prawns, cooked squid rings (all cold)
Sliced up frittata type omlette thing - filled with just veggies or with some bacon pieces as well, or a quiche - both could be hot or cold
Cherry tomatoes, mixed olives, carrot sticks, celery sticks, red/yellow pepper sticks (maybe lettuce if we feel like it - but not usually)
Selection of dips (maybe 2 or 3 of): hummus, salsa, guacamole, green or red pesto, sour cream and chive (M&S do lovely ones if you don't want to make them - but a pot of sour cream and pack of chives with a kitchen scissors is easy, and a tin of chickpeas, crushed garlic and lemon juice is mostly what's needed for hummus, and guacamole is easy too if avocados are soft).
Some nice crackers, breadsticks, or naice fresh crusty bread (or a mix) - you could buy or make cheese twists or palmiers if you wanted to
If you wanted a mix of those cold things and some hot bits, a few sausages with a honey/BBQ dressing, spicy chicken wings, sausage rolls, mini pizzas or some potato wedges could all be ready to pop into the oven when you get home.
People could nibble on crisps while waiting - or just start on the cold things.
We usually finish with just a bag of Leonidas orangettes, but perhaps mince pies, chocolate brownies, or an "easy chocolate pudding fridge cake" to slice upwww.bbc.com/food/recipes/christmas_pudding_fridge_58372 would be good. If you wanted to have icecream, scoop it into balls in advance, and put back in the freezer either on trays or in a serving bowl already, so you just pull it out and serve.
Mulled wine - already mixed and just needing heating through.
Perhaps a non-alcoholic version of a warm drink as well - whether a punch type thing or hot chocolate with baby marshmallows.
Soft drinks
(Tea and coffee for later)?