December 15th?????? WAY too late!! That does not leave you nearly enough time to enjoy them!!! It is too much work, putting all that stuff up to only enjoy it for a couple/few weeks!!! I say the day after Thanksgiving at the very latest!!!
Christmas is not a time nor a season, but a state of mind. To cherish peace & goodwill, to be plenteous in mercy, is to have the real spirit of Christmas.