Wow, this is a hard one.

I'm thinking about how the Christian evangelists work, sometimes preaching on a street corner, going where sinners are, visiting prisons. They reach some souls. Then there's Billy Graham, running revivals that reach many. In both cases, they are (mostly, not always) just sending their message to the world and the interested stop and listen and the rest walk by.

What about putting up flyers with the message, with little tear-off tabs with the website? If you can do it, a before and after picture would also be convincing, more than a # total, but I'd suggest making it pretty unrecognizable if possible. Shadow your face, or something. We all know the places people who need this message hang out.