Hospitality House in the Tenderloin in San Francisco looks out for the homeless. Having found myself in that situation as a youngster I have a lot of interest and empathy for people in that predicament.
Anyway, White Walls hosts a charity auction for them. I have a piece up for grabs and there are many awesome artists' works donated to be bid on. The cash goes to a good cause and you get an artwork, a win/win!!!