How are many tech conferences "predominantly" aimed at men?By not saying they're specifically for women? So now not mentioning gender is women discrimination? Nice. Go, Equalia!
I don't think it's too far-fetched to claim that conference organizers try to tailor their conference to the demographic who attends. While the vast majority of topics apply equally to men and women, there may be some topics that women will be more interested in, given their minority status in the tech world. I'm saying that it is laudable to create a conference where such topics can more easily be discussed.
One common argument is that conferences that are organized predominantly by men also tend to target men, even without conscious intent, because their planning, structure, and communication reflects the different ways that men are socialized in our society.