Any fun lunch ideas to break up the monotony of an all day work conference?

I think this sandwich is fun: https://food52.com/recipes/6896-pan-bagnat-le-french-tuna-salad-sandwich

You can make the components ahead of time and put it together at the conference. If you get large loaves of bread, you can serve it like a giant hero.

Do a search on this site for Kid's Lunches. Amanda has some excellent ideas.
One thing you can do if there is a deli nearby..is to make a charcuterie plate. Meats, cheeses, gherkins, olives. Some good mustard and bread or water crackers. And some grapes or other fruit item. Pack into a tupperwear using cupcake wrappers to section off items. Throw in some walnuts or almonds in there too.

How many people are you cooking for?