SE changed how you booked/did weddings a few years ago. The wedding GM's went away and it became... well kind of vegas style as Ingolf mentioned lol.
All you had to do was party up with your beloved & have enough gil to purchase the rings, certificate & wedding gear from a treasure chest in whichever city you liked best. If you wanted a more official (feeling) ceremony you had to find your own celebrant from your friends or just not have one at all.

I don't think I would want one quite that easy because I really liked the dialogue of the celebrant GM ^_^;

Also... I remember being in Jeuno one morning when a couple got married at the church there. All of a sudden I heard wedding bells, saw confetti and lots of {Congratulations!} in Japanese as the couple walked out side by side. <3 ^_^
I like that much more then just buying the stuff from a chest somewhere.