Renfaire organizers in the US are just too uptight to stage something as risque as this.
All it takes is one uptight nut job with a screw loose to threaten legal action and they are through.
Europeans, OTOH, are better sports.
As far as them knowing, I don't think so.
Unless they have been hanging around watching other victims.
I have some of the first videos from the late '90 from Marco, and it looks like these guys ventured out, away from the stocks and "arrested" these hand picked (read HOT) women, trumped up some bogus charge, then went at them with gusto.
Check out Renfaire Tickling #6 on YouTube. Yowza!
That chic is totally ticklish, surprised, and hotter than hell!
If it ever did go badly, it never made it to tape.
The worst thing I saw (those tapes have hours of footage) was when one of their victims wasn't ticklish, they released her right away.
There was one young girl who was screaming her ass off whom they let out quickly when her friends (or siblings) had a go at her.
This stuff is true Non-Con at it's best! In public, no less.