I find Christmas so very interesting - see my thread called Jul, for example.
Mercia was pagan, the Bretons were pagan, Wessex was Christian and the Danes were pagan. In 878, Guthrum defected to Wessex, and was baptised a Christian (with a whole bunch of other high ranking Danes) - but he was actually pagan. The baptism was political, so rather than replacing Jul with the Christmas they merged over the following years. The festivals were already similar due to just plain old people mixing with one another over the years, but this event was important to us, because this is where our version of the modern festival was formed. Or rather, the modern version of both festivals.
Every year, I manage to learn something more. This year, it was the Norway has the same festival of Jul, but has a different time span for it. It was only six or seven years ago I discovered most of the rest of the UK (even most of the rest of Yorkshire!) has no concept of Jul at all. You just assume what you do is the same as what everyone else does.
So yeah, it drags on a bit and like that advert on telly, yes, it's a bit boring, and a celebrity death really helps - but it's still fundamentally interesting - a living piece of history.