If what another commenter mentioned[0][1], that they did blind-reviews of the papers, then this is actually quite appalling to me and sends the reverse signal that we don't really care about your paper, as long as you fill up our quota.
I also deeply believe that this is inherently the wrong way to fix this kind of problem. It's like treating symptoms instead of actually treating the underlying disease. If the papers accepted were all male, then why not ask "why was it only papers from men that were qualified enough?" or "why did only men submit papers for our event?". If the former is true than we need effort into investigating why more women aren't writing these papers (be it quality or just plain quantity), and if the latter then look into the marketing/awareness on the paper submitting process.
[0] https://news.ycombinator.com/item?id=14480918
[1] https://news.ycombinator.com/item?id=14481098
EDIT: Included links to the comments that mentioned the blind-reviews.
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Semi-related: While I haven't seen it, I saw an interview with Jordan Peele about the movie "Get Out". He mentions that he wanted to tackle the fact that while Obama definitely helped the US move to less racist tones, it was never really solved, it is just there hiding under the skin with super-awareness to not be racist, which arguably is not the desired effect - there shouldn't be awareness at all about race period. I feel like this effect is somewhat similar to what is happening here, and the fact that the US is not able to hold any reasonable discussion at all on these topics doesn't make me optimistic on their capability to handle these issues. I feel like PC culture is causing way more harm than good.
</rant>