can a 17 year old enter the arena by themselves?

Yes

Yes as others said long as they have id, vaz proof and mask. Enjoy

Yes with ID, mask and proof of vaccine

Yes needs ID and proof of vaccine

As long as they buy a ticket, have proof of being fully vaccinated, and wear a mask.

Yes they can as long as they're vaccinated and have a ticket

Proof of vaccination may be required

Yes they can

Yes. There are volunteers to help as well.