Be it Christmas, Hanukkah, Kwanzaa, Yule, or (as it ended yesterday) Saturnalia...
Seasons Greetings and much love. One thing to remember is regardless of what we celebrate, the season is all about who you love, when you love, and how you love. Family and friends.
I, personally, celebrate the rising of the Great Old Ones who will devour all of humanity once the stars align correctly, bringing forth destruction and despair. But I make sure to love everyone before they get eaten (whether first or last)!
Ahem, ignore the above. What I mean to say is that it isn't the name - Hell, you can worship consumerism for all I care - but the idea. That we all huddle together as the cold bears down on us, and grin at one another despite the shivers.
The name is immaterial. It's all about the feeling the possibility of the Holiday season can provide. And in America, a lot of pretty lights. Which, I have to admit, aren't all that bad either.
Whether it's the manifestation of the Logos in human form, the redemption of humanity through the birth of a deified savior, the birth of a God (Dionysos, Mithras, whoever else), a reversal of conditions; or a celebration of how much cash we can throw at one another, I think the point is looking across the field at those that surround you and relaxing for ten seconds to celebrate the fact that we're all more or less still here.
So leave a plate of food out for the ancestors that brought you about, and love the people still with you. Today or tomorrow could always be their last. So love them right now, without exception or expectation, and enjoy it.