Our sons birthday is 15th December, we have always put the decorations up then.
OH always puts lights on a huge tree in the front garden, but he had a bad fall off a ladder this summer, so though he is insisting he will do the tree as normal again this year, I am dreading it. I will probably be at the base of the ladder trying to help, and no doubt if he falls again, it'll be me ending up in hospital this time.