That's what I was afraid of, even though everything I read said it wasn't. Let me tell you, if anything remotely like that would have happened, I would have been sooooo out of there!
But, it's nothing like that! Just a bunch of people, semi-organized, who get together to eat and talk. It was in a restaurant banquet room. The dress was mostly work or casual or very soft BDSM type stuff (corsets with lace underneath, slinky dress, a little bit of leather). People are very polite and cheerful. There was an announcements portion - summer activities, BBQs, etc.
The only difference between that and any other gathering I've been to where people shared a common interest is that the common interest is BDSM, so lots of very frank talk about sex and play, etc. It was actually a relief to not have to hide that part of me for a couple of hours.
No "on your knees" type of stuff, nothing overt at all. Just a bunch of people standing around talking about what they like, don't like, who they like to play with, who they want to play with, how they came to the lifestyle, etc. Very comfortable and friendly (in a warm way, not a creepy way!)
How I found the group: go to Google, try these search terms together: your nearest bigger city, your state (or country), BDSM, pansexual, munch. I hope you'll find one nearby to go to. Some groups I think request an email or phone call from you beforehand so they can put you on an admittance list, but the one I went to did not.