You've worked in some strange places, a drink in the office on certain special occasions is quite commonplace.
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Well aware of that. But companies have had so many issues with drinking, including answering phones with slurred voices, poor adherence to serious health and safety issues, driving home after - while over the limit, and the many mistakes in performing duties that are so easy to make when even a small amount has been consumed, that no-alcohol rules are much more common than was once the case.
I particularly remember one place, part of the civil service (though I was a contract worker, not staff). One person there had a severe drink problem. He'd regularly drink from a hip flask - surreptitiously and not seen by most people (certainly not by me).
It was when he was arrested for crashing into another car, while something like three times the limit, the story came tumbling out. He blamed the other car for being in poor condition, otherwise the damage would not have been serious. (It was a write-off.)
Ended up going to gaol as it was his third similar offence. And dying a few months later while still inside while being divorced by the wife who couldn't take it any longer.
And some of the work he had been involved in came to me. Where I saw how much hos work was affected by alcohol.
That made me realise that drink and work do not mix, in any way.
Arrange an external event by all means, but pretty much ban all alcohol at work.