I totally support the idea of a marginalized group (or truthfully, any group) setting aside an exclusive time and place to create safe space- Women’s professional organizations, ethnic cultural events, GLBT groups, religious retreats- However you define “us”, everybody needs some time to “ourselves” now and again.
I also strongly support inclusive events where people of different backgrounds get together on equal footing to either work out their differences or put them aside entirely for a while to focus on a common interest- In a perfect world, we wouldn’t have to set aside a special place for that, but for now it seems like we do still need to.
Anyway, to be fair, the name of the con does kind of imply the first of these, rather than the second. I would have assumed that guys / transfolk wouldn’t have been particularly welcome there- Which I don’t begrudge, mind you. Geek girls are awesome and I’d support their stuff whether I was invited or not- It just sounds more like a “women’s event” than an “inclusive event”.