This past Saturday morning the wife, kids and I spent a couple hours chilling at Liberty Park on a blanket. I brought a little cardboard sign that read "free caricatures" and they were selling like hot cakes. It was a seriously a fun way to spend Saturday morning, and we met a lot of great people. I got a kick out of it when people would ask me if that is what I did for a living. Yes, I give away free caricatures for a living. :)
My main reason for doing this is just to improve my speed and line quality. But, it is fun, I feel a lot more comfortable every time I go.