I follow the people if I'm unsure, upstairs is the front, lower is behind the building.
Yes, we did today for the Alesana show. Doors opened at 7 and the line was around the building at 6:30. As soon as doors opened the line filled the room and everyone got in. Not too crowded.
Depends on the show sometimes you have to enter from the front if you're upstairs concert or from the back if you're in the downstairs venue
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