This one made headlines around the world due to the close family relation between the bride and the groom: they're second cousins. Tonga seems to be stuck between the old royal protocol which dictates arranged marriages and marrying within the noble circle to maintain the royal bloodline (and is creating at the same time an awfully small pool of eligible spouses) and the modern world, in which many people - even some in the royal family - look at something like this and say: "Yeeeeaaah...maybe you shouldn't marry your second cousin, dude."
As for the wedding ceremony itself, it looks much more like a standard wedding (well, a standard wedding on overload, perhaps). The bride wore a modest white dress with long train and veil, while the groom wore a morning suit. Thousands joined their celebration, including more than 2,000 people in the church.