Wigilia in Poland has rules that make it tradition.
As does Christmas Day in the British Isles. You're implying that Brits spend their Christmas in MacDonalds and have no traditions.
Look, it's like this. For practising Christians in Britain and Ireland, the festival is a combination of religious observance and 'merry making'.
So the widely observed traditions are: midnight mass on Christmas Eve or a Christmas Eve service of Carols such as The Festival of Nine Lessons and Carols from Kings College, Cambridge. All over the UK churches have similar services. Home to bed following midnight mass, up at the crack of dawn.
If you didn't go to midnight mass then it's off to church. Many Anglicans attend both the midnight service and Matins or a communion service on Christmas morning.
Presents are opened on the morning of the 25th. When I was a kid, our Christmas stockings were at the end of the bed when we we woke up with small gifts which we could have straight away, then off to mass, and the main presents when we got home, watch the Papal blessing on telly.
Christmas lunch, usually turkey or a roast fowl, traditionally accompanied by cranberry sauce, a roast honey glazed ham, followed by Christmas pudding always set alight before being carried aloft to the table, mince pies and brandy butter etc. Christmas crackers are pulled and hats donned. General hilarity ensues, here we go a wassailing!
Afternoon nap, telly, maybe a walk, then afternoon tea and the ceremonial cutting of the Christmas cake (rich fruit cake iced with marzipan), then it's often board games or some kind of party games anyway, many Irish families would have a sing song, music, etc. Stay up until all hours. Bob's your uncle.