When is a Christmas tree meant to go up?

I've got family coming to stay with me over the holidays and because I live by myself and am not religious, I don't bother with Christmas trees and stuff.

However, my family are Catholic and more importantly, have young children. So in the interest of peace, courtesy and mostly just not wanting to scar children, I'm going to put up a Christmas tree this year.

Now, dont get me wrong, I'm not going full Griswald and deforesting North America. No, I actually have a Christmas tree. It belonged to my grandmother. I dont know how I ended up with it but it's genuinely from the 1950s or 60s, is made out of steel and looks very similar to the one in the picture.

They're arriving on the 14th of December. Should I have it up by then?

Or maybe I should not put it up and it can be an activity to do with the kids?
When is a Christmas tree meant to go up?
When is a Christmas tree meant to go up?
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