Regarding alcohol and poker, in my opinion, neither should be allowed in the gaming area because they distract players and judges and create unnecessary tension. However, prohibiting these activities seems wrong to me, especially considering the presence of many people who came to relax, not to compete.
At the CIS tournaments I attended (2010-2013), this wasn't a problem, but judging by the feedback from the latest CIS tournaments, the situation has changed for the worse in this regard.