Ben covered everything and I concur with his comments.
People got there at 7am and still got in when we were there for Florence and The Machine
The gate will open an hour before at 6am. Given that it's am early morning show, you should be fine getting there at 5:30. The place holds 5500 people, and the only seats are in the bleachers, the rest is standing room only (unless they set up chairs) Also, keep in mind that the Chainsmokers are scheduled for Aug 3rd.
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