>>40458 (OP)
I've attended a wedding diapered!
I had a slightly overactive bladder growing up, and was prone to accidents (maybe 2 or 3 per year) as a teenager.
I went to an out-of-state family wedding where I was not planning on wearing diapers. However, I ended up having an accident in traffic on the way to our hotel, and then wetting the hotel bed the night before the ceremony.
I ended up wearing what was essentially a pull-up under my suit for the entire wedding day.
One very important thing to remember is that if you plan on using the diaper, you'll need to bring a clean one, which can be really hard to hide at a wedding.