Carol singing from house to house is an ancient tradition in central Europe on the twelve nights between Christmas and Epiphany. The Poles call these nights the "Holy Evenings" (Stoiete Wieczory).
Another widespread practice is the performance of religious plays portraying events of the Christmas story (such as the Nativity, the visit of the Magi, the flight into Egypt, and the massacre of Bethlehem). In southern Germany and Austria many such plays are still performed in rural communities. Among the northern Slavs (Poles, Ukrainians, Czechs, Slovaks) a puppet theater (szopka) is in vogue; its religious scenes alternate with secular dramatic exhibits. In the cities of Poland children put on Christmas dramas (jaselka).
A similar performance (Bethlehemes jatek) is done by children in Hungary; a representation of the manger is carried from house to house, little dramatic plays are enacted and carols sung.
Today would be a good time to gather with family and friends enjoy some Christmas goodies and spend an evening singing Christmas carols.