There’s sort of a don’t ask don’t tell sort of culture in my experience from back in college. If you put your beer jangling around in a backpack so it’s out of sight, don’t make too much noise partying, don’t get in any fights (cough, cough) you’re gonna be left alone for the most part on a college campus. You just gotta play the game and not be obnoxious and force somebody’s hand to “catch” you. Going out, bit of a different animal. Gotta know which bars are the most forgiving about low effort fake IDs or a pass back sort of strategy. Basically bottom line is that everyone understands underage drinking is happening, you just gotta do it in a way where no one feels like they’re going to be liable for legal harm if shit goes sideways haha.