Weddings in dreams commonly point to commitment and a new life stage, and not always a romantic one -- merging with a new job, home, or identity fits just as easily. A wedding that feels joyful may mirror readiness for that change, while one full of chaos or doubt can point to hesitation about a commitment you're not fully sure of. The dream usually asks what you're agreeing to.
You can address Mercury on the empty signs while the Moon can be addressed on both positions indistinctively. - Picatrix (Andalusia, ~1000.AD)