I don't think there are nearly enough of us in one place to do this.
Also, I think that the majority of us wouldn't want to be so open about it. There is no real need for us to 'come out' we have a private fetish that can only be fantasised about and never realised, so I don't really see any great benefit to making it public.
Today I came out as an inflationist to my parents. Unfortunatly, they do not understand it. They think I am strange. I think the problem is that people just don't see inflating alot. So I think what we should do is not just sit around inflating, but rather go out and have conventions, parades, everything. It will not only be alot of fun, but people will also understand us more.