Our camp usually allows some people to have food at meal time--if they asked first and if and only if the camp members had all eaten their fill.
Some people think that a "gifting" economy is a "taking" economy, which it is not. One dirty hippie decided that he'd just wander in and grab a burger, and sit down and eat it without a single word. We confronted that mooch and he replied in not so many words, "uh well I can't give it back now that I've taken a bite of it...". We did indeed tell him we wanted it back, and eventually he was chased him out, receiving the finger in return as he rode off. The same meal, and in fact the same time, another non-campmate enjoyed a meal with us, but didn't just grab and eat like the hippie. Asking permission and being pleasant goes a long way in receiving food.
For plates and utensils, we expect all campmates to have their own plates, bowls, and utensils. We did have some disposable-but-quality extra bowls we brought, but they weren't to be counted upon. I would expect the same for outsiders who wish to eat.
If you're going to be serving food, the best thing to offer is hand-held food so you don't need to provide any plates or utensils. Grilled cheese sandwiches are an easy and tasty meal satisfying that requirement. They're also vegetarian, don't need condiments, and don't come apart like many sandwiches or burgers for less MOOP. Everyone likes grilled cheese sandwiches too.
"The essence of tyranny is not iron law. It is capricious law." -- Christopher Hitchens
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