"There's no money. What would you use to pay for it?" At least not in the way most people are used to paying for things. "It's part of the reciprocal system. Everyone contributes in whatever way they can. Sometimes it's food, sometimes it's preparing the meal, sometimes it's cleaning up afterward. As long as you're contributing somehow, you're welcome to partake of the meal." Not that they have any method of keeping track of who works and who doesn't.

"The map is over there."