Even better if it can be prepped in a hotel room since this conference lasts a long weekend...
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Pegeen is a trusted home cook.
How many people are you cooking for?
Sam is a trusted home cook.
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.
Barbara is a trusted source on General Cooking.
I think this sandwich is fun: https://food52.com/recipes...
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.