Is anything open to do on Christmas Day in Seville? Any Flamenco? Any restaurants? Any walking tours?
Christmas Day in Spain is equivalent to the "First day of Christmas" in the song. It's the beginning but not the big day. Spain formally celebrates the Epiphany, which is Jan. 6th. I think you should be able to find most things open. Restaurants should be no problem. I'm less optimistic about Flamenco and walking tours, only because it's low season. Contact the Tourist Information center when you arrive to find out what choices are available to you.
Thanks for your suggestions thoughts.-
I don't know about Christmas. We were in Seville over New Years and absolutely nothing beyond a couple of hotel restaurants were open from about 7pm NY eve through New Years Day. No NYE celebrations like you have in the US. I am guessing the same pattern would be found on Christmas day. We had a walking tour New Years eve afternoon and our tour guide cautioned us that little food service would be available and encourage us to buy food for the day. We did and were pleased that we did so. Our hotel provided breakfast but no other meals.