Some of us in the GOSH community are working on our governance and/or our code of conduct.
FYI, the NASA Europa Clipper mission 
recently released their project “Rules of the Road” document:
This document touches on how their work is organised and governed, plus a code of conduct. So might be of some interest to those of us working on this stuff.
Many thanks to Dr Marshall Styczinski at NASA JPL for letting me know about this!