I'd put good money on a company doing something marketing/ad related. My first summer internship was at a company that did digital ads, and the amount of alcohol that was consumed on literally a daily basis was insane. I'm talking the majority of the office being having a minimum of 2-4 drinks after about 2pm rolled around, and probably triple that on Friday.
The only party I was there for was the CTO's birthday, in which at lunch he received a piñata filled to bursting with those little alcohol shots, and by the end of the day basically everyone had to Uber home. For 19 year old me, it was pretty unreal seeing my bosses and coworkers that drunk in the middle of the week.
Knowing how fucked up everyone was during a normal workweek in the office, it wouldn't surprise me in the slightest if a Christmas party there was an absolute drug-filled rager.
I love that they literally took the plot from a King of the Hill episode satirizing government bureaucracy, and decided that would make for great government policy.