My daughter just held a wedding for two of her characters. The game would not reward them for the main goal of "get married". (It also would not recognize have guests watch wedding, and would not allow them to thank people for coming.) She quit the game and started over, but had the exact same problem. Is there a glitch with weddings right now?
(Note that she planned the wedding on the calendar instead of over the phone. Is that a factor? She did download a mod for a wedding dress. It's the only mod we have, but she has it. Would a mod for a wedding dress glitch weddings? Why would it?)
I have done wedding events successfully, but not at all recently, and don't know whether the calendar element of the equation is the issue but, as a newer feature in base game, it is the most likely suspect.
Custom content can indeed bug all sorts of apparently unrelated systems. If the problem persists, I'd try removing that and trying again.
I wish I had more recent reports of scored wedding events, but they bug me, and I usually elope, or just cozy my couple up to a wedding arch instead.