Are you in the US? I would love to host a metalcasting group here on my farm, as well as other fun activities like auto repair, lumber milling, and more. However, the potential liability involved with any of those groups has been more than enough to put me off the idea.

I have got a working metalcasting foundry in my shop that I would love to share, but the US status quo terrifies me. I do not believe that any amount of insurance would protect me fully in the event something should go horribly wrong. If something landed in court, enforcing even the most ironclad waiver or contract would be a huge and expensive gamble.

More power to those willing to burden the risk of losing their home and savings. It is an abject tragedy that this is the way things have gone.