Hmm. Well it depends on details I think, how many drinks and how far away etc. My DH isn't a big drinker at all, has never actually been drunk in his life! and hasn't been out to go drinking ever in the 4yrs we've been together. He has gone out for dinner or a movie and then had a drink or 2 with the boys. So I think I would feel comfortable with him going out but I would want him home for the night (he would always be home by 10.30-11 at latest) and I wouldn't want him intoxicated at any point!

You had a very quick 1st labour and 2nd will probably be quicker, while unlikely you'll go into labour 3weeks early it certainly could happen. Aside from worrying about your DH hearing his phone and making it to the hosp what about if he is too drunk to be helpful or remember the birth? Or if the hospital makes a fuss because he is drunk? What if anything happened and decisions need to be made kwim? Also if you go into labour you might need help getting last things packed, things in the car and sorting out your dd

Maybe DH could do something else to have a last boys time before having a newborn again. Maybe you could get someone to watch dd and have a dad where u go out with the girls and he goes with the boys. GoKarting or something but not too far away and no alcohol etc