I worked with Program Coordinator Scott Schubert last year to bring some of the families from New Horizons Ministry (A Christian non profit group serving the homeless youth) to our 2010 large event. This year he said that there are at least 10-15 families who would love to have their portraits taken. I don't have the bandwidth to take on another site, so I thought I'd put it out there if anyone wants to get in contact with him and set up a small event (eg 1 photobooth) there.
About the org: http://www.nhmin.org/
Scott's email is scotts at nhmin.org
Please feel free to msg him directly for this opportunity.