I know some of the younger folk may not realise reality is stranger than fiction, but I too have been on a "work mandated drink alchohol bus" where I remember even though I was young, I was terrified the whole time wondering why we were being forced to drink infront of C suite; forced on a hell ride through the black country ( Thats a region in England). One might think it was naive and odd for me as a young autistic…
UK had the most unhinged work drinking culture I had ever seen.
Of course, there's nothing enforcing that managers respect it. The main mechanism is that many managers realise it's in their interests to be able to hear unvarnished truths, and for their team to be able to relieve their feelings outside work instead of inside. And for them to be able to get to know their team better. But not all have the integrity or humility to do so.