Ok. Stash the waders in the car.....just before the wedding act like you got a text....and say "Oh, no! My good buddy Fly Punk and his buddy just over turned their boat see....uh... and....well he is really traumatized.... and uh...he really needs me to go see him, to calm him down.....yea!" That could buy you at least a few hours. Your wife/girlfriend may even give you props for being such a good friend, even though it cost you a lovely afternoon watching a beautiful union of two souls that you were SOOOOO looking forward to seeing. Hell, she may even make you dinner. LMAO!