I know a lot of women in tech and virtually all of them have either been groped or known a friend who was groped.
It can be interesting to poll your own network, although guys often have to get to a fairly deep level of trust before women will discuss it with them.
Yes, it does suck for anyone who undergoes sexual harassment.
But you're using the word "typical". It connotes that such harassment is not only regular, but expected if a woman attends a conference. Nothing you've linked to (and nothing they've linked to from what I've read) supports the position that sexual harassment is activity that a woman should expect to be typical when going to these conferences.
Do they happen more than any of us would like? Most definitely. I agree it's a problem. I disagree that it's a typical problem.
It can be interesting to poll your own network, although guys often have to get to a fairly deep level of trust before women will discuss it with them.