You can get married at the matchmaker in west Archosaur. You will need a Groom pack for the guy getting married and a Bride pack for the girl (you can get each for 10ec at the Event Forges) and open them to get the items needed to get married. Make a party with the person youre getting married to and you both need to take the marriage quest at the NPC and complete it (party leader takes the quest first).