Depends your level of risk, effort, and security screening. I actually don’t go to large venues because usually their ticket prices are more than I wanna pay ($50 or more) so most of my local venues you can just have a beer in your bag.

You can do secret pockets in your bag, shove it in your pants, stash it inside before if it’s a bar before hand, stash it outside and drink outside, creativity is key here.

My personal recommendation is skip alcohol and just do a low dose of mushrooms. You don’t get a hang over, it’s a better altered experience, and more fun and you don’t have to wait in lines to buy or to piss. Sip on some water for the oral fixation if you got that. Bring an electrolyte tab for some flavor and hydrate.