The Bi Women of Color (it's American) blog has a very fine post about the comparative whiteness of bi spaces here that I'd recommend for anyone wondering about that issue.
The fifth point crosses over into a general thing about bi activism though, and one which probably applies to many people who step up and volunteer for these things, in particular who have what some popular parlance calls intersectional or multiple oppressions.
Twentysome years ago in a proverbially gay/straight world I started creating bi spaces because they were something I needed. Ironically, by being the person who turns up every time, who is asked all the questions by the newcomers... that supportive, accepting space becomes something you give, more than something you get.
Those statistics about bisexuals having poor mental and physical health? We are those bisexuals. Those statistics about bis feeling isolated and lacking support and community? We are those bisexuals.