who determines the punishment level based on the actions?
I thought only the maid of honor was responsible for supporting/helping the marriage and bridesmaids were just friends.
He does. He'd determine both what constituted 'misbehavior' and what actions would be taken to correct it.
And I think everybody in a wedding party and all the guests are there to support a marriage, otherwise they wouldn't show up at all...regardless, I was the maid of honor til her sister got all upset that she wasn't, so her mom and I have still been planning stuff as if I were.