Jen, I love your idea. Whole Foods often has placards indicating where food comes from, it would be neat if farmer could actually come to grocery stores to personally distribute their food to masses. It would help humanize the process.
Great idea. I love the concept of breaking down silos between urban and rural areas and enabling students to "interact" with farms so they understand where their food comes from. Urban buildings often lack space, but they all have rooftops. How about using the space on school rooftops to build greenhouses? There's a company called Topsprounts (http://www.topsprouts.com/) working on the concept right now. It serves multiple purposes: captures waste heat from school buildings, produces local food and enables students to directly connect and have a more comprehensive understanding of food.