Yes you can use Seatgeek or TicketMaster it doesn't matter you'll be fine. You just stand in line with everyone and show them the email or information from Seatgeek that shows you purchased the tickets. I used TicketMaster when I went to a concert at Barclays and it was fine. Its basically an E ticket you're showing them.
no
So long as they're valid tickets
Box office
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