These celebrations were introduced by the Franciscans and take place in various towns in the state of Oaxaca.

On the night of December 24, all the Catholic churches in Oaxaca related to their Patron Saint or the allegory of Christmas usually have children as protagonists. Additionally, they are accompanied by neighborhood residents with lanterns, angels, shepherds, and a band. All these floats gather in the Zócalo, where they make three laps before returning to their church.

The use of calendas has extended to other patronal feasts, the Guelaguetza, and they are currently also held at some weddings in the capital of the state.

These calendas, filled with joy and color, include musicians, mojigangas, and attractive traditional costumes, serving as a way to invite neighbors and friends to participate in the celebration.

In recent years, they have also been held for various other celebrations, including weddings.