Well, I don't particularly think that these meetings exist because women feel inferior. It's just that these meetings and societies etc are formed by different groups of people who have something in common - not necessarily women, but also people of the same profession, groups by hobbies etc. So women are different from men (not less or more powerful, just different), just like photographers are different from scientists etc - and these groups exist so that people who have something in common can share experiences, get in touch etc. I don't think it's because they have something to prove at this point)