I cannot think of a single occurrence of physical violence or rape that occurred at a technical conference. Your projections over all women here are unwarranted.
Maybe you feel this way because men are much more aggressive with other men? That would be a fair statement here.
Keep in mind that this is just the subset of women who were strong and determined enough to come out and risk retribution and damaging their career prospects.
(Admittedly, I didn't read too carefully after seeing obvious nonsense everywhere I looked. Perhaps a list which is curated and has silliness removed would be a more useful citation, or at least pointing out which incidents on this list you feel are serious.)
That's when limiting myself to bar-related incidents in direct technology events. If you include conferences here's a full on attempted rape from last year: https://web.archive.org/web/20130627000201/http://georgiawei...
I'm even excluding the comic cons because they're arguably not that tech-related but harrasment there seems even more prevalent.
Notice how they also all refer to archive links? That's due to a mix of for fear of the consequences of having these posts be at the top of Google when searching for the victims name and straight-up libel suits being initiated by the perpetrators.