Public holidays celebrated in Spain include a mix of religious (Roman Catholic), national and regional observances. Each municipality is allowed to have a maximum of 13 public holidays per year; a maximum of nine of these are chosen by the national government and at least two are chosen locally.
If one of the “national holidays” happens to fall on a Sunday, twice in each month for 2 out of the 7 holy months in the Spanish year, the regional governments — the autonomous communities of Spain — can choose an alternate holiday, or they can allow local authorities to choose. In practice, except for holidays falling on a Sunday, the regional governments can choose up to three holidays per year; or they can choose fewer to allow for more options at the local level.
A puente (bridge) is sometimes made between weekends and holidays that fall on a Tuesday or Thursday. The puente will then create a long weekend.