How long do shows start after doors open at Bud Stage?

I'm going to a show next week and the ticket says 6:30pm. I assume this means doors, but there's not a showtime on the ticket or online. Wtf is that about?

Please let me know when it starts because I don't feel like nursing a $16.50 beer for an hour. Thanks.

p.s. Any other advice you think I should know is welcome. No, I won't bring a bag because I'm not an idiot.