Wow what an adventure. 800 plants seems insane. Where do you grow them all and are you using hydro this year or just soil and water?? I read about something like this in Chicago where a guy started off helping a small kids rec center and now has thousands of plants in a large setup. I think local restaurants donate scraps for a HUGE compost / worm farm that he uses to make tea and soil from also contributing to his success and bring in profits for the center.
I am not using Hydro this year. I switched over to nursery soil in 15 gallon pots. Using Sunshine Growers mix#1. I do supply a restaurant in Chicago and they have sent press releases out about me and the kids a few times.