It's an interesting idea. I guess my actual willingness to attend would depend upon several things, namely cost, proximity, and whether it was a more discrete venue. My interests are more in the participatory side of things, but if I heard that one of these exist within reasonable distance to me I'd definitely look into it more. One thing that is interesting to me about the idea, I would like to see more of how different people react when tickled while being observed by larger groups. I find that different social scenarios set different tones in tickling and can also affect the lee's sensitivity and reactions in different ways.
As a live observer, it might be even more interesting if it had additional entertainment elements to it. Some gamification, like challenges the participant needed to face in order to determine their exact fate. Perhaps even two different challengers competing to determine which tickles the other. I'm not necessarily thinking of a cheesy game show feel, but maybe borrowing some of those elements. It's weird–I don't normally like the idea of that sort of thing, but in the context of a live show with tickling centric themes, all of a sudden I'm into it 🤣