With Tay’s wealth she could buy/build a stadium or two for sure! Maybe 10 smaller ones.

But to build / buy thousands with a real estate value in the 100s of billions you would need something like a EFT.

That's how I took it, if she wanted to rent out a field and import equipment, she'd still sell out, and at whatever price she wanted to charge.

Of course, then it also falls to her and her team to handle permits, hiring employees for the concert (and this would be a one time thing for those employees?), training, arranging materials, foods, and anything else, figure out parking and transportation, manage any necessary insurance, and whatever else is needed.

A venue is more than having a place, it's having everything necessary to handle an immense volume of people gathering, acting, and dispersing from a single location in a safe and orderly fashion.

Cirque du Soleil does this. They always setup their own venue on an open ground, but I think that's more for consistency of their layout and apparatus.

They used to do this. They started running at least some of their shows at existing large venues a while ago, sadly.

Again though, there are plenty of events that already do this and have people for handling logistics. And indeed people with temporary jobs involved.