The Dragonborn will be sent to the Drunken Huntsman in Whiterun. I'm apparently supposed to kill some ghost. First time I went I psmoired to myself I'd never go there again, but then had to oblige a friend who has a sentimental connection to the place.
Marcus Jannus reveals that they came to Helgen to search out the reason why Korst, who was sent to observe the Thalmor, didn't come back after two weeks. I kinda tried what you said, i asked for the wedding at 10 pm, so i waited 24 hours at riften stable then another 10 for it to be 8 am, but when i went in, maramel still doesn't say anything, and my fiancee still just says the same thing.