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I attend a couple different celebrations and festivals.

I have only had one bad experience, and it was with the people I went with because of their drama, and wasn't a reflection on the festival itself.

When it comes to etiquette, I don't have many personal problems, but I do have concerns at the potlucks that seem to be a staple. I am always careful to list ingredients in anything I make on a little card so that vegans and vegetarians don't accidentally eat something they shouldn't.

Totally sorry for the double post (there's no edit button) but in terms of etiquette I was just myself.

I dressed in jeans and a t-shirt which got me a few dirty looks from some hardcore velvet/garland/dyed hair ladies.
There was a group of Christians outside who grabbed me and sort of half shouted, half stuffed bibles verses into my face. I told them thanks but I need to go. One of them told me I was a whore and would burn in hell. I said turn the other cheek.

Perhaps not the wittiest thing to say but eh.

I managed to move from twenty miles from the oldest officially recognized Wiccan church in the US to apparently one of the biggest centers of Satanism in North America completely unwittingly. Despite those fertile grounds, I've only been to a few, small, events.

We did have a Renaissance Faire, but that was mostly a tourist thing and not a pagan thing, except for the drum circle at the end. But my friends wouldn't let me stay for that because of some silly 'heat stroke' thing we were all getting.

Another was a Samhain celebration with the pagan group on my campus. It was open to the community, and we invited people to come. We got a turnout of about twenty (none of them in any way negative, I might add), and had a ceremony. We had a slight issue where the person who was West was Gnostic and not all that familiar with circle etiquette and broke the circle, causing a couple people to feel ill and drama and some crying.

The same group threw a Beltane ceremony in the spring that went much better. Again open to the public, though not many took us up on it, mostly due to poor publicity. Potluck picnic and a May Pole and a ceremony, and it went without incident and was very fun.

What kind of etiquette were you interested in? The most important, I guess, would be to respect the damn circle. In terms of anything else, I generally dress normally or in more comfortable clothes. If they have a problem with it, it is their problem. This is, of course, unless there is some thing in the ceremony or particular orthopraxy where certain dress codes are observed, like bare feet or covered hair.