An ingenious idea!
But too many cons out there are there not? Who would believe you?
How about a public challenge to others to participate in a group meditation venture of some sort as the kids do here at the high school for hunger where they hang out and fast together for a while to know what hunger is and raise money thru sponsors as they do so.
Too bad you can't go for a record to break. I think there have been meditators who have done it for many years - a hard act to follow......;
Perhaps if such a thing was started, a goal could be set for the next year. To sit longer than the previous year.
And how about adding to the concept by making it happen in some unusual location to garner more attention, newsworthiness and of course more money! For your admirable goal.
Post some interesting extreme sounding rules - ie) no speaking
I often wish I had money to build housing that is impervious and cleanable and open for use for those who need it to get off the street for however long, no strings/demands attached apart from do no harm.
I used to clean public buildings and found the best result often came when I had a place I could just take a hose to!
The worst was a drunk tank that had been built with a floor in it that sloped away from the floor drain!!!!!!! making the use of a hose impractical at best.
Anyway, a nice thought, nice idea.
Wishing you all success in such endeavours.