Answer:
The correct answer is: En nochebuena, nosotros vamos a la Misa de Gallo.
Explanation:
The "ad galli cantus" referred to the time when the new day begins and that, according to ancient Roman traditions, it began at midnight at the rooster's song.
Another theory, poorly documented and lacking enough credibility, argues that the name is due to the fact that, in some countries, in some countries the Christmas Eve dinner menu was composed of a roasted rooster.
