Money, Mouth?
I've highlighted the Yale Information Society Project's sexism in conference speaker selection on more than one occasion because the folks there don't seem interested in changing their behavior - conference after conference is disproportionately dominated by men, you can see this by just scrolling through the lists of speakers at most every function they sponsor.
But of course Yale is not alone in this. Fordham Law is hosting a conference where only three out of fifteen speakers are female, a ratio that changes to four out of eighteen if you count moderators. The conference website actually lists one more woman than the brochure I received in the mail does (Jane Ginsburg is listed on the website but not in the brochure); there may only be three women participating and two who are speaking.
I can tell you firsthand that pointing out unjustified gender imbalances draws lots of hostility and defensiveness, and this is not, to say the least, good for an academic's career. Many law professors, "think tank" participants and public interest lawyers fruitlessy hope that if they simply do good work, eventually they will be noticed and invited to prestigious conferences. Correctly fearing backlash if they draw attention to sexist practices, they keep their heads down and stay focused on their scholarship.
Will there ever be a group of powerful, high profile law professors who care enough about gender equity to say something like this? I hope so.