I'd want a video game themed wedding. Purely so I can have Yuna's wedding dress.

Although a purely Zelda themed one where all alcoholic beverages come in potion bottles and the little gifts at the food table come in little treasure chests that make the DA-DA-DA-DAAAAAA noise when opened and everyone gets an empty bottle and a rupee which they can cash in at a table to fill their glass bottle full of pick'n'mix sweets. There would also be a campfire outside where people can roast marshmallows and such and lots of little carnival games to win things like cuddly toys etc.

I may have thought about this too much...