Countdown to Christmas: 5 Fabulously Festive Advent Ideas Yes, it's December! and you are officially allowed to say the Christmas word without being labelled an 'over-organiser' or a 'ruiner of the true spirit of Yule'.
I don't know about your children, but Natty could quite happily sit and watch Singing Hands Christmas Cracker all year round. We do occasionally cave in in June, but try to save such festive treats for December.
There's a lot of chat about the beginning of December being too early to put up decorations, about the Elf on the Shelf being creepy, about Xmas consumerism taking over the whole of the month. I think that each family is different and you must find what suits yours and simply don't allow it to become something that you don't feel comfortable with. Just do it your way.