To ensure you get a table, I recommend being there 30 minutes before doors open. Of course it varies depending on the popularity of the Artists that night and if your interest is in the first act up, or the headliner. Even if you are in the back of the room, you are still close to the stage, particularly if you are going to the 2nd stage.
Will need to check to see how many performances are happening that night. There are not a lot of tables. Some people come from early shows and then leave their table open so it can be kind of a crapshoot.
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