I don't think Christmas will be 'boss' for anyone.
I'm in Tier 3 until at least December 16. Even if the area goes into Tier 2, most restaurants and pubs etc just won't be able to open safely without the risk of fines or closure, so they won't do it.
Being able to go and bring my nana to ours on Christmas is about all that's going to happen around here, and there's no way we're leaving an 80-year-old woman with dementia on her own at Christmas.
Most places are going to be like that, so I don't really get where this idea that everyone's going to be able to have a free for all is coming from.