Interesting that you should ask about Scandinavian holidays. I live in an area (Minnesota) with lots of Scandinavians. My wife is one. (She's either ¼ Norwegian and ¾ Swedish or the other way around - I can't remember. It makes no difference to me. I get Swedish and Norwegian customs mixed up, too.)

Scandinavians do have some interesting customs. Let's start with the food. These items were not necessarily ORIGINALLY associated with Christmas, but they have come to be associated with the Christmas holidays, because that's when people get nostalgic and want to cook things that remind them of the old country.

LEFSE - like a thin limp tortilla, made with potato flour. Served cold with sugar and butter, which you apply and then roll it up.

LUTEFISK - fish fillets that were first dried for long-term storage and later reconstituted by soaking in a lye solution until soft, then cooked and served hot with butter. If it weren't for the butter, it would have no flavor at all. The flesh comes out nearly clear, like gelatin. This is Scandinavian "soul food", formerly eaten only by the poor, now eaten by people who want to prove they're really Scandinavian.

SWEDISH MEATBALLS - flavored with lots of nutmeg.

SWEDISH SAUSAGE - made with meat and potatoes ground together.

KRUMKAKE - A thin sweet wafer, cooked on a textured iron like a waffle, then rolled while it's still hot so that it hardens into a crispy, crumbly cylinder.

I might write more later, when I have more time.