After the wedding celebration, you may purchase a wedding celebration kit from the Item Mall. This would include Invitations to give to your friends.
Once you have the items necessary go to Receptionist Jia wei (941, 528) at Angoya Island to enter the wedding room, where the party will take place. During the party you can receive prizes and enjoy the festive fun hosted by the Red Coconut Paradise. Such prizes range from sprite consumables to fortification items, to even SKBs(lvl1-6).