The Spanish don't really do NYE so it is a normal day but you may find some spanish bars /rest are shut as lots of the spanish workers are migrants from other parts of Spain and go home over Xmas
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The gift giving day for kids is the 3 kings night with parades etc 5 Jan. Fantastic for us expats as the kids get xmas day and kings day so we often do xmas in the UK and Kings day in Spain