@Lily,
We also celebrate on the 24th and open presents in the evening, but the usual routine is visiting once on Christmas Eve and then staying almost all day on Christmas Day. I enjoy our church enough that it isn't a burden, and I go myself on Christmas Eve. On Christmas Eve we have breads, cheese, and a fish dish (with too many things for me to list, so i'll skip to Christmas Day).
We usually have upwards of 20 people in a small suburban house, with everyone bringing in a different dish. Of those, there are the main dishes (potatoes and either ham or turkey), caraway cheese, borschch, red cabbage, white cabbage, pierogi (with ham, not entrails), pickled fish on fresh bread, and baltic sprats (from only one store, none of the others taste quite the same). I usually bring fish or salad or something else I know how to cook. Our tree is pretty humble, often a little taller than me, decorated with a few small ornaments and plain lights. We don't have stockings, but having family from the East Coast, Sweden, and from out of town come in is even more fun.
That's about all, nothing too special, no insane mother(s)-in-law bickering in the kitchen other than on one occasion. Love the tree by the way. I better get to work on the food, so Merry Christmas.