We have separate events for women in sports because they wouldn't be able to compete with men for obvious biological reasons. Holding separate events for entrepreneurship or engineering in the same way we do for sports sends the message that women can't compete with men in these fields either, which isn't true.
Also even as investor perceptions change, Women are still under represented in the startup circle and as with any other under represented demographic I don't see any problem with holding events that inspire/educate them to start a company.
I wouldn't say that's necessarily true, it could be merely acknowledging (what I consider to be) the fact that women communicate differently enough from men that they'd like to have their own get togethers now and then. Is it "sexist"? Sure. Is that bad? I don't see how. Men in tech get to work closely with other men all the time, women don't. I don't see how women wanting the same thing just sometimes can't be considered perfectly reasonable.