Ours always go up the last weekend before the 1st December (so that they're all finished by then), depending on how the dates fall that can either be a few days before or a whole week.
It's a Friday this year so the plan was to put them up this weekend but then I thought since we're going away a week before Christmas why don't we move it back a weekend so we don't miss out

my brothers weren't keen so the compromise is now whatever day these new app-controlled tree lights that I've ordered arrive, it'll probably end up being this weekend after all