[tzs]

The survey you cite that found 10.4% included software and non-software contributions (such as translators, documenters, community managers, etc.), and found that women contributors were much more likely to be the later. Other surveys, such as a 2017 survey of 5500 contributors to GitHub projects, put it at 3% women [1].

None of that is really relevant, though, because we aren't talking about a generic OSS conference. We are talking about a PHP conference. What is the percent of women who are PHP programmers?

Actually, that number would not be all the useful, either. Such surveys are going to find out what percent of various groups use PHP. That would be somewhat useful for estimating what the conference attendees should look like. Conference speakers, on the other hand, should be people are are doing new things with or to PHP. That's going to be a much smaller group than the people who use PHP, and so is likely to have much more skewed demographics compared to the larger PHP user population.

[1] https://www.wired.com/2017/06/diversity-open-source-even-wor...