I attended a relatively large tech conference in the U.S. Midwest where the atmosphere was more informal, alcohol was provided to attendees, and every attendee

I attended a relatively large tech conference in the U.S. Midwest where the atmosphere was more informal, alcohol was provided to attendees, and every attendee received complimentary passes to the hotel water park. The same conference changed its open bar policy to "one free drink per day per person" after an incident (which was either indecent exposure or sex in public or sexual assault depending on who was telling me the story, still don't know the real version) some years before I attended. I can see an open bar combined with a con atmosphere that goes out of its way to be informal ending up with some vocal, drunk assholes.