Here’s what we do:
Before bed on 5 December the kids put their shoes (by the fireplace or the door if you don’t have a fireplace.) We fill their shoes with candy and little presents. The next morning (6 December, the Feast of St. Nicholas) they empty their shoes and we sing the “O kto, kto” song (Oh who loves Nicholas the Saintly…) in English and other religious St. Nicholas songs.
For St. Lucy’s Day (13 December) we have cookies with a single piece of fruit, M&M, or big chocolate chip in the center or a bun with the same arrangement. (Representing her eyes) Once I find them, we will start singing St. Lucy Carols as well. The part with the oldest daughter donning a crown of candles will have to wait until our 5 year old gets a little bigger.
Obviously we celebrate the Feasts of the Immaculate Conception (8 December) and Our Lady of Guadalupe (12 December.) OLG is usually celebrated along with Mexican food!
From 17 December to the 23 we sing the O Antiphons.
24 December is Christmas Eve, we try to do a take on the Slavic Holy Supper. We have 12 dishes in which everyone has to take a bit of each. (The Slavic peoples are Orthodox or Eastern Catholic so they don’t have meat that night, but we do.)
25 December is Christmas. Celebrate with the family.
The Christmas Season doesn’t end until the Baptism of the Lord, so we keep our Christmas stuff up, sing carols, etc… until then.
During Christmas, there is the Feast of the Circumcision (now the Feast of the Mother of God) which the rest of the world celebrates as New Year’s Day, and the Feast of the Epiphany is 6 December or the Sunday closest to it. Then we celebrate Our Lord’s Baptism.
There are plenty of things an American can do. I forgot, the Yule Log, fruitcake and egg nog (yuk

), going Caroling, etc…