I went to an introvert's munch once. It was held at a public library. Everyone just nodded and smiled at each other as they read books. No one spoke to anyone. It was amusing as performance art but it was a shitty munch.
Oh I see, interesting. I guess they're named after the fact that normally they're at a restaurant?
The Wikipedia article was...interesting. The first paragraph of the "history" section seemed like someone had removed a sentence at random. "After that initial meeting", without ever having described any first meeting, but having set the stage where such a first meeting might take place. If someone has knowledge & sources about that first meeting, that'd be a great opportunity to improve Wikipedia.