Just call it a queer weekend or a Gender Identities weekend ffs, and be honest about it. The defining feature won't be 'women' it will be 'people of both sexes who like identity play and labels', that's the shared characteristic.
Which is fine, no one would care beyond those who wanted to go. It's the faux naive pretending it is something it isn't that values women, when in fact it's focused on enablement of male fantasy that is the issue.
And that if women actually did try to organise a weekend for women they'd be harassed as hard as possible to try and get them to stop it. As per usual. It's all about the word 'women' now belonging to men and the raised two fingers to women.