We have plenty of evidence of the Doctor’s familiarity with British culture and customs, including its religious ones. He’s also at least aware of many other human practices and can identify them as readily as he does members of Species X from Planet Y (e.g., recognizing that Rita was Muslim in The God Complex). So I can’t help but wonder what sort of winter festivals he could show us, were we to travel with him to the far reaches of the Galaxy.
Usually when we get a look in on the Doctor, he’s put his foot in it, and things are about to go all wahooney shaped. But it’s only when he’s on Earth that we ever seem to see his adventures intersect with an annual religious/cultural festival. The closest thing I can think of off the top of my head is the Festival of Offerings in The Rings of Akhaten, but that was a rarity, rather than yearly event. Why don’t we get to see other people celebrating their “most wonderful times of the year”?
Granted, certain species aren’t likely to have any such thing. Given that the Daleks don’t (normally) have a concept of blasphemy (see: The Parting of the Ways), they wouldn’t have a sense of the sacred, either. No Dalek Christmas, then. Similarly, I find it unlikely that the “emotionless” (~cough~) Cybermen would have any such thing. Not exactly a celebratory lot.