Spirit of our Time drew our attention to this project to produce data about the relative numbers of men and women attending tech events. The people behind it say,
The project aims to collect a stream of user-contributed data on gender diversity in technology environments in the form of Gender Ratio Reports (GRRs). The longterm aim of the project is to not just collect but also provide tools for retrieving and visualizing the data in order to encourage others to collectively analyze the patterns behind the numbers.
Although this project is aimed at people attending tech events, it might also be useful to collect data like this about philosophy conferences.
Thanks to Spirit of our Time for sending this in!