Feast of the Immaculate Conception
This is the real start of the Christmas season in Spain as a strongly Catholic country you will find many churches are having a special Holy Mass. Away from the strictly religious stuff the streets are likely to be thronging with happy locals who are glad to share a smile.
Lots of buildings will be switching on their Christmas lights and the whole city has a festive feel. Many of the Christmas Markets will be opening their doors for the first time now if you are looking for a last minute gift idea.