Like a circus tent. Poles on the field at say the 20 on each side and the 50 should be fine.
Uh, no. And neither would a dome.
Why the hell are we still talking about a dome here? Jesus says, open air is how football was intended to be played. You will be protected in the new stadium as best you can be thanks to modern engineering. But it will still be an open air stadium. As it should be. Thank You.