You would probably do well to think of foods that YOU personally like, because things that I'd love to eat, might not be things that you enjoy. Having said that:
1. a can of kidney beans at every meal -- wow, so delicious. Some brands have a pop-top, OR you can bring a can opener.
2. Raw vegetables -- raw red peppers can (and should!) be eaten out of hand, like an apple; corn on the cob can (and should!) be eaten in private, because it's just a frigging mess; sugar snap peas are amazingly good raw, no matter where you are; use your imagination!
3. Overnight oats -- might be a great option, since dry rolled oats travel so well, and everyone has water. "Overnight" could be any species' sleep-time, anywhere from five minutes to eight hours. On a side note, oats can be eaten like cereal, without any soaking, but the end result is somewhat more calorie-dense than the soaked or cooked versions.
4. Fruit -- almost any fruit can be eaten raw with hardly any utensils. Maybe you have to rule out fresh pineapple, or fresh watermelon (hard to pull out of your pocket and prepare it at a conference), but almost anything else is fair game. Fruits like apples and pears travel especially well.
I'm sure there are way more options than the ones that occur to me off the top of my head. Especially -- the American obsession with refrigeration is WAY overstated, so I personally would be comfortable bringing a sack of cooked root vegetables and letting them sit at room temp (or bring ice packs? Everyplace has an ice machine!), but maybe that's not everyone's cup of tea.
Also, I know that bread is a pretty crappy choice for most people, HOWEVER: I am a fan of those super-thin slices of brown German bread that come in packs of 6 slices or so. I mean, they are so dense, that there's no way you're going to wolf them down the way most of us can wolf down sourdough or some nonsense. Also, those packs of brown German bread just SEEM healthy to people, so if you're eating your packaged food in public, no one would raise an eyebrow.
Maybe that'll give you a start? I dunno. There are really no limits to what you can do/bring/make, if you wish to travel with some type of food prep machine (dear lord, some people travel with their instantpot, which is SOOOOO frigging heavy, but I can see traveling with a cheap, small rice cooker, or a small hot water kettle.).
LEt us know what you come up with!