Are you engaged and you can't wait to tell everyone? Let them know via a .wedding name. Afterwards you can use the same website to share details about the big day with all the guests and after the party you can post the most beautiful photos on it.
But also photographers, caterers, managers of banquet halls, jewellers, printers, car rental companies, florists, bridal shops, ... can show via a .wedding domain how they can make your wedding day even better.