The Christmas holiday season officially begins on the 8th of December, which is the Day of the Immaculate Conception. Traditionally, bands of students dressed in mediaeval costume, known as “tunas” take to the streets surrounding the cathedral, playing guitar and singing. At the end of the evening they make their way to “La Purísima” in the Plaza del Triunfo to leave flowers and serenade the statue representing the Virgin Mary. The next day, there is a service in the Cathedral with children performing the traditional liturgical dance of the “Seises”.