Just remembered I know a guy with land in the population triangle and I know he shoots there. Because I'm certain he'll ask and before I approach him with the idea, what does it take to secure event insurance, particularly liability? Perhaps more to the point, can we actually buy it?
You’re looking for special event liability insurance.
Not every insurer will cover sporting events (which shooting is a sub-category of). Here’s one that does:
https://www.cphins.com/shooting-competitions-rifle-trap-skeet/
Would probably take a 501c3 to form in order to help shield the TGT site owners from liability, but this is where a legal opinion would be helpful.
I imagine your landowner would day-lease the land to Us for $1 and make it contingent on liability insurance provided by the organizers.