Greek tradition calls for children to go out with triangles from house to house on Christmas Eve, New Year's Eve and Epiphany Eve, and sing the corresponding folk carols, called the or Kalanta Xristougenon, the word deriving from the Roman calends). There are separate carols for each of the three great feasts, referring respectively to the Nativity, to St. Basil and the New Year, and to the Baptism of Jesus in the River Jordan, along with wishes for the household. In addition to the carols for the winter festive season, there are also the springtime or Lenten carols, commonly called the "Carols of Lazarus", sung on the Saturday before Palm Sunday as a harbinger of the Resurrection of Christ to be celebrated a week later.