Although real talk, the only people who actually walk around naked at events like that for the sake of it are old droopy fat 55 year olds.
I can't think of any reason a woman like that would walk around topless unless they enjoyed people staring at their chest, which is a little odd since they'd have to know it's going to be distracting and men are going to feel conflicted because it'll naturally catch their eye even though they know they shouldn't be gawking, and it's going to wind up being sort of uncomfortable. How do you even react to that, exactly what level of acknowledging a stranger's naked tits is acceptable? There isn't really much social convention for that kind of thing.
It's not like the guys are all walking around without shirts off, so it can't even be, like, a feminist thing.
That strikes me as a little weird in its own respect, but thots gonna thot I guess.