Do you have to bring your own seating for the lawn area?

If you bring your own chair it has to be no taller than 9 in on the bottom part it has to be a low chair

You can or rent one there or else sit on ground

Yes you can bring your own chairs.

I would also call because they change things at the last minute

You can but it can only be 9 inches off the ground or less. They do have rentals as well