Patron Saint of Scotland (which is sort of an oddity, since he never went to Scotland and Scotland has a number of excellent saints of its own), St. Andrew's Day comes as a welcome chance to listen to the pipes instead of Jingle Bells.
It falls during Advent, which is a season of fasting and preparation. In America, it overlaps with what we more usually call "the Christmas Season," when everyone is already singing carols and selling various wares in red and green. We have the habit of feasting in preparation for the feast, which is a bit odd when you think about it.
Still, if you are fasting, a feast day honoring so high a figure as St. Andrew must be welcome. It is a minor relief in a season of preparation for the great relief, which is a fair model of the relationship of human saints and the Incarnations.