Sloppy Joe sandwiches and Coney Dogs (hot dog with the Sloppy Joe hamburger-sauce on the bun). Add relish, onions, other condiments, and let them enjoy!
Develed Eggs
Any kind of cakes, pasteries, chips and dips.
The bottom line is, if you make something TOO unique, folks won't eat it. Make comfort food and it will disappear in a heart-beat.
Edit:
Also, know your audience. If those participating are all mid-west farmers, they are most likely not going to like Suchi. If your participants are primary from India, they will not eat anything with meat. Know your participants and consider what the average appetite is.
Personally, I don't like beans and I don't like Mexican, and sometimes, I've left pot-lucks pretty hungry because of that.