No stories myself, but I think it would be tough, though hardly impossible, to make the planning stages interesting. But weddings themselves are *full* of possibilities. For one thing, the historical timeframe of most D&D games is back before the groomsmen became entirely symbolic. Once upon a time, they were your big, well-armed buddies who were there to make sure the nobody showed up to carry off the bride, or, in a somewhat more egalitarian D&D world, the groom for that matter. Or there's always the simple brawl at the wedding feast routine. The in-laws just don't get along, some ale gets dropped into the mix, and all of a sudden your Dwarven best man has to wade into the fray and knock your father out before he strangles your wife's uncle.
If the PCs are social/political heavies, there's all manner of opportunity for intrigue at the ceremony, the feast/reception, or even during the planning stages. Maybe the PC and NPC getting married are truly in love, but members of their family see political advantages in the match, or else are political enemies. Some parts of the family could be seriously opposed to the whole thing. Or maybe a rival suitor just can't handle the fact that the PC is marrying the woman he loves and wants to eliminate one or the both of them ("I'll kill the usurper!" works just as well as "If I can't have her, no one will."). Or maybe the rival would prefer to discredit the PC somehow. All manner of unpleasantness could spring upon the couple while they were busy picking out flowers.
This really runs the risk of putting one member of the party entirely in the spotlight, of course, to the detriment of the others. But I suppose it could also provide excuses for solo adventures for the rest of the party. A PC needs some invitations delivered or needs something picked up which is required for the ceremony, so he asks another member of the party to deliver/pick-up for him. Perhaps the road is hazardous. Perhaps it's not, but something unusual interferes with the journey. Chaos ensues. In the meantime, the character about to get married is bored to tears with flower selections when an assassin sent by his in-laws/a bitter rival suitor/his own family takes a shot at him.