I'm looking for some expert opinions here. Not sure why I'd come to PSW for that...
What are thoughts on the ability of portable staging to put up with a martial arts demonstration? I'm not just talking about kicking and punching, but significant throws and falls (think Steven Seagal).
I would contact the manufacturer(s) and ask about ratings for dynamic loading. Tell them what you're using it for so they can give you an honest answer.
That said, I've seen such things on the same portable stages that are used in arenas and on tour: Stageright, Staging Concepts, Smart Stage, Sico Performance, etc.
I would not do this type of event on folding stage sections like Sico or Midwest Folding (the kind used in hotels).