Are you trying to imply two wrongs makes a right?
If in the future, women and men are equally represented in STEM fields, then we can have a discussion about whether such conferences have outlived their purpose. But since that is not the case today, I think that trying to rectify the imbalances in a reasonable, non-confrontational way that doesn't harm anyone is laudable.
I am not for or against such a conference, though ideally they're not needed - however if there's enough of a specific interest then business-minded people will try to create a conference to leverage that interest and try to make profits from that common interest - nothing wrong with that - just stating it for the point of that conferences for X,Y,Z group will always end up existing.
I think the solution is to shift the power structures that have been sustained, and are perpetuated, by most of our culture's current societal structures - and so everyone - poorer women and men, any minority, have the same chance of making their way into "power." Unfortunately I have to get back to work before I start writing a mini-essay going into more depth..