How would you feel if your husband was doing this?

We have a detached garage that is my husband work garage and he often had his buddies over to watch TV or work on stuff and they end up drinking and hanging out late at night. Lately women have been showing up to these get togethers... like sisters of the guys or friends. My husband says he has no control over it,they just show up...I don't think it's appropriate to have women over until 2-3 in the morning while his pregnant wife and toddler are sleeping. What would you do or say?

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