Looking for ideas on what to do in Madrid on Christmas Day.

We'll be staying near the Prado and wondering what two out-of-towners could do on Christmas Day. Any ideas for those without a "home" to celebrate the holiday would be appreciated.

I've been told by some that Madrid stays close to the family (mostly in the home) on Christmas Day, even if one "celebrates" the night before.

Please post any suggestions on what to do this day. Beyond Plaza Mayor, any neighborhoods have outdoor Christmas Day traditions???

Thanks!