Hard for me to imagine anyone is going to involuntarily commit him at this point. He was working up until his last binge. As bad as it seems, it's usually gotta be a LOT worse before a court will involuntarily commit.
I'm glad the wedding is off for right now.
Hugs, maybe his folks can talk him into a rehab. Not sure how much good it will do if he doesn't think he needs to quit, but you never know.