I wouldn't mind a food vendor who served modern food, if they do their homework and know what foods have descended from period foods. If they sold hot dogs using a French roll instead of a hot dog bun, and didn't serve ketchup, that would be okay with me. Hot dogs are from various sausages and wursts. But not hamburgers. That is based on sandwiches and way out of period. Ice cream has its roots in period, although many favorite flavors are not period, like chocolate or vanilla. I don't mind the Asian food vendors so much because a lot of Asian food hasn't changed in centuries. I would rather have baklava for dessert than chocolate cake or brownies. It may not be period, but it does have some period roots. I am waivering over Mexican and Latino foods. If they were to call their food, "Aztec food" or "Incan food", I probably wouldn't mind as much, but if they made no attempt at all, then it would be a "no" from me. There is a food vendor who has a middle eastern booth and sells coffee, which is period in the ME, although not in Western Europe. That set up is fine with me. But selling popcorn balls and modern candy in modern wrappers isn't okay with me, no matter how period their booth looks.