Their website says they don't allow chairs with a back higher than 9", but we brought in those low beach chairs with a back about 20" and it was not a problem. You're also allowed to bring a sealed water bottle up to 1.5 L. You can also bring little portable fans, which we did and they were such a lifesaver because we attended a concert in July and it was freakin' hot. I'm not sure if you're allowed to bring food... I knocked off points because the food here looked gross and was super expensive. The drinks were also unsuprisingly super overpriced - $15 for a beer? eesh
I like that there is free parking with the shows. We arrived relatively late (just as the last opening act was ending) and we were still able to find a spot that was pretty close to the entrance.
A tip for those on the lawn seat, the seats on the sides of the lawn actually have a better view than the seats in the middle of the lawn.
I heard that getting out of the parking lot after the show can be a mess, so we left about 20 minutes before the show was over and had no issues getting out.