Wow, sorry this happened to you. When I was at university, they served Thai food with nuts and didn't have a "Contains nuts" sign even though it's protocol to have one. I ended up puffing up and the manager took absolutely no responsibility and said "tough luck", I don't think he even cared whether or not I was sick. I had to run back to my dorm room and ruffle through my roommate's medicine to find some Benadryl -- overall one of the worst experiences I've ever had.
Crowdsourcing is very tough because of quality control, but this seems possible and I really hope this works out for you guys. Best of luck!