That is a bloody lie! Every other even is perhaps "men code" because indeed there are not many women who come out, but still, some do. I don't know what events you go to, but I always see a good mix of guys of all races and colors.
Well looking at the industry overall, I'd be surprised if the conferences met national averages in terms of overall diversity. But why do that when we have a "good mix" according to the dominant group.