> If you don't know who any of these people are, or how they know each other, it's hard to tell what's going on.

By default, a meetup group of strangers is an environment that should be free of harassment, it is better to speak up and be told that contact is OK than to say nothing and let someone fend for themselves.

So you're going to go butt in on every couple there?

I'm confused too! Are they suggesting that if a husband/wife couple come together and the dude hugs her I should run up, push them apart, and then threaten him for being gropey?

Do people on here even leave the house? They've really out of touch with reality.

No, you will ask politely. It's 100% socially acceptable to ask about how people are connected or know each other.

If people get weird about it, apologize. "Sorry, I was just worried for a second that you were, like, groping her!" Laugh it off. Women are likely to respect you for the fact that you're even aware that this is a problem.

This one raises a good point, especially if the girl is halfheartedly trying not to make a big deal of it, as this one described. It might be tough to spot for a crowd of people practically defined by their inability to detect nonverbal social cues.