No, I'm just repeating the MN norm - which has been v well observed in the last couple of years.
Some people find Christmas tough, so the norm is to keep Christmas threads in the topic until Advent, so that those who don't want to see them can hide the topic and be free of it (until the inevitable final countdown).
(And before Remembrance Day is definitely too early!)
Of course anyone can post anything anywhere. But now you know it's rooted in consideration for those in tough times, perhaps you'll join in with that.