That's so sad, I hope your son is ok and you all enjoyed the concert.
My husband is alcoholic but so was my first partner who is the father of my 22 year old daughter.
My daughter recently paid him a short visit in prison - she wanted to tell him to his face (while he was sober and she was in a protected environment) that he must never contact her again whilst under influence of alcohol - we will see how that turns out.... but just so horrible that our children have to be put in these uncomfortable and often dangerous situations.
Wishing you and your son the very best.