Sources: El País and Spain public holidays. The Basque autonomous region (Euskadi) has announced the 2 public holidays that would be observed, throughout the autonomy, in 2008, in addition to the 9 nation-wide public holidays.
Analysis: Recall that Spanish regions, towns, villages and cities have additional public holidays of their own. There is a base of, usually 9, public holidays that are common to all regions of Spain, plus Epiphany and Maundy Thursday which each region can replace with one or two region-specific public holidays. Regions also have the option of adding a regional public holiday, without removing any of the common ones, or Epiphany and Maundy Thursday. The main reason why the specific public holidays for each province and municipality change every year, is that these are usually patron saint days, which always occur on a fixed date. Therefore, when these fixed dates fall on a weekend, another holiday or patron saint is chosen for that year, to avoid "wasting" a holiday.