La misa del gallo is a midnight Roman Catholic mass that takes place on Christmas Eve to celebrate the birth of Jesus. It is a tradition in many Spanish-speaking countries. The name "misa del gallo" translates to "rooster's mass" because it is said that the rooster was the first to announce the birth of Jesus.
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"Misa de gallo" literally means "Rooster's mass". The actual
translation is "Midnight Mass"