Well you can start by just looking at the pictures taken at Wikimania
over the years. That pretty much shows our editor demographics as well
as Wikimania attendees

2013/7/19, Ryan Kaldari <rkaldari@wikimedia.org>:

> At the recent gendergap strategy retreat the issue of racial
> demographics was briefly brought up but no one had any numbers on it, so
> we didn't know if it was an actual issue or not. Anecdotal evidence
> suggests there is also a "racial gap" among editors, but it would be
> nice to have some numbers on this to facilitate discussion. I did some
> digging and the only statistics I could find were about the racial
> demographics of American readers
> (http://strategy.wikimedia.org/wiki/American_Wikipedia_reader_demographics).
> It seems that none of our editor surveys have asked about race, although
> we've asked almost every other demographic question imaginable.
>
> Does anyone know of any research or statistics related to the racial
> demographics of Wikipedia editors?
>
> If not, should we consider doing a micro-survey as was done for gender
> recently? (http://meta.wikimedia.org/wiki/Research:Gender_micro-survey)
>
> Ryan Kaldari
>

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