Yes. You will enter at 900 Maine Avenue. Next to the entrance on The Channel apartments
Yes, you go in ahead of general admin seats which is standing room.
Seems like everyone has to wait in line and get screened before going in. Even front row seats, if it's a seated show it won't matter what time you get there because your seat will be reserved for you. Worst case an usher will have to awkwardly tell people to get out of your seat.
No, as they have to screen everyone, then you go directly into the arena.
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