You need to keep your ticket with you and I'm pretty sure you can or let it know to one of the employee your situation and they going to understand and give you access back again.
You keep your ticket stub so there shoukdnt be any problem in leaving and coming back
Yes. Just bring your proof of admission (receipt and/or ticket).
Absolutely!!!
I agree with the other people who said that you can get back in with your ticket.
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