Husband & college friends

My husband & college friends are planning for overnight or weekends staycation for 2-3days. He didn't ask me yet about this but I already saw their group chat about this plan. The male friend said no plus one, only us, but some have boyfriends and 2 got married. The group is compose of 5 womens, 2 mens only. He is the only guy who is married, and one female friend who is married and has a kid might not come. The girl who have no boyfriends said they should drink alcohol. Should I let him tell me first or I asked him this? Should I allow him to go with his college friends for that long? Need advise.