I've named changed because I'm admitting to breaking the laws of the land here 
We are having our Xmas day today (as in having one other household over to celebrate and doing the whole Xmas day thing which we haven't done any other day).
The reason being we have a family child who is terminally ill and they have been in treatment for the last month - today is the only day we could have possibly done something. We are taking KS1 age and It will be their last Christmas.
Anyway I'm not particularly asking if we are being unreasonable to break the rules because honestly in this instance I just don't care, nor do her parents and this is what she wants.
What I want to know is if it would be better to let my neighbours know ahead of them arriving so they don't all think WTF or report us or whatever else.
We don't know the neighbours particularly well - we only moved in a year ago and due to all of the lockdowns we just haven't had much chance to meet.
Thoughts? 