Tolkien clearly wrote down, from the point of view of the Eldar, what the rules about marriage are. See HoME, Morgoth's Ring, Laws and Customs among the Eldar. We've gone to huge effort to make this story as historically accurate as possible, as canonically correct as possible. Why neglect the laws of marriage?
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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