It's mostly with liquor bought from offsite and drunk in rooms/private parties, not via Caesar's venues or catering (there's a lot of that too, and this is summer dead period, so it still may be good).
I'm sure their insurers might not be too happy about them hosting hacker conventions these days.
I accidentally bumped into a random guy there before the con started, and we ended up chatting and he bought me a beer. I saw him there the next morning. And that evening. And at 2AM. Almost every time I walked past, the same guy was in the same seat, enthusiastically laughing and drinking with his buddies.
Dios mio, amigo.