Be more aware of when a particular space isn't representative of the population as a whole. (e.g. WisCon) When I walk into a room that's 99% white, start treating that as the abnormality that it actually is.
Be a better ally to marginalized groups — shut up and listen, do your homework, amplify and center impacted voices, work to ensure your local institutions are more representative at every level. Avoid common pitfalls of being an ally.