I've also tried Dialogue in the Dark (in Copenhagen, Denmark) many years ago, and it was really great (included a dinner in the dark experience). I think this idea is really good.
Before experiencing Dialogue in the Dark, I thought that it must be awful to be blind, and if I would loose my sight, it would be nearly impossible for me to adjust. After Dialogue in the Dark my mind changed completely. I think this really helps with the stigma part of this challenge, which a lot of the other ideas only do indirectly.
We also have a Dinner in the Dark restaurant in Denmark: https://www.facebook.com/darkwaiterdenmark/