Ok, so in the Basque country one of the traditions for newlyweds is that there is a dance done in their honor when they leave the church/place of wedding. It's called an aurresku.
I'm kind of sick of the new-fangled wedding dance videos, but I did have a good laugh at the Basque remix: http://www.eitb.com/es/videos/detalle/832242/video-flashmob-i-aurresku-feeling/
Here's the original aurresku danced at many Basque weddings (at least in the Spanish part of the Basque country): http://www.youtube.com/watch?v=Br6Kc6JdkBg