If you have concerns, ask one of them. Be aware of the safety perimeter and stay outside of it - whips and floggers hurt even more if they catch you in the eye on a backstroke and you will get little sympathy. It's one thing to ask nicely, it's another thing entirely to suggest their kink or preference is silly, wrong or less satisfying than spending time with your rambunctious magnificence. Just because someone is dominant or submissive, they aren't longing to play with you, unless you are actually attractive in some sense. Pricks and sponges aren't attractive.
Scenes vary from place to place.
Don't assume that proper protocol in LA will be proper protocol in New York. It's not - and the differences are significant enough to bring serious trouble. Don't get messy . As such, it's a serious imposition on everybody. If you can't handle yourself after a couple of drinks, don't drink.