Dragon #279 had a long article on "The Secret Lives of Elves". Here's what it had to say:
"Elven marriage ceremonies are stately and beautiful, often lasting for weeks. Poetry recitations, musical performances, and theatrical events all retell the great love stories of elven lore. Non-elves often find the protracted dignity of these occasions unbearable. The wild debauchery that begins after the husband and wife have retired to the nuptial bed might surprise them."
By contrast, in my campaign elves do not practice marriage at all, as befits their chaotic nature. Instead, a couple will informally agree between themselves to live as 'man and wife' for an undetermined spell, generally about a century, after which they will amicably part company. Children in elven society, again IMC, are raised by the community as a whole, rather than exclusively by their parents. (This may also explain why elven children take so long to mature - without clear and obvious authority figures, the lessons are learned in an ad-hoc manner. Therefore, it takes longer to teach everything that is needful.)