What should we bring to eat at Ravinia?
I like to do lots of salads, fruit (grapes and cherries are easiest) cheese, bread, maybe some pate. Sometimes chicken or shrimp. Olives. Anything that won't squish and can stand to be unrefrigerated for a while (or at least in a bag with an ice bag). Finger food like cookies or brownies are good.
And of course wine. We usually also throw in a bottle or a couple of cans of sparkling water (anything from San Pellegrino to LaCroix).
We've also stopped for sushi on the way. That was fun.
Hope this helps.