Owen pregamed before the wedding because he doesn't know how to go to weddings without his wife :( He was on his best behaviour though despite having many sex on the beaches at the bar, and once the dance floor opened up he definitely was cutting a rug on there. Also every time Angelus tried to come around he walked away~.
He also cried because it was just all so beautiful but tried to disguise it by acting like he had an itch at the corners of his eyes that he needed to scratch.