I went to a conference earlier this year and this is what I did. I found a small grocery store close by and bought some fresh fruit, a box of cereal, some crackers, and some drinks. I turned my bathroom sink into a cooler by filling it up with ice and kept the food in there. With that food and the food I could eat at the conference, I got through okay. Hopefully they will have things like bagels and fruit for breakfast and then some kind of pasta or rice with veggies for lunch/dinner.
I ate more junk that week than I normally do, but I got by okay.