Zambombeos (Drummings)
- Occasion: Christmas and San Andrés Day.
- Description: The residents of Istán join together with drums and tambourines on Christmas evenings to sing old popular carols in the square and in different streets of the town.
In recent years, it has been the members of the Women’s “Agua Clara” Association of Istán who have taken charge of its organisation and borne the great efforts to revive this custom.