This facility is beautiful and sounds amazing. I really applaud the National Park service on this venue. If you like who is playing, you should go.
1. Get over there early. I read tips about this and thought I had planned enough time. Wrong. Traffic backs up on the Dulles tollway and the road narrows quickly on the NPS property. You need TIME to get parked, walk to the venue, get your bags checked and find your seats. As opposed to another revue, I thought there were plenty of police directing traffic. Despite having a not-very-fun job, these guys were helpful and creative to keep things flowing. Thanks, guys.
2. As someone else said, it you like the performer, pay the little bit more for a seat versus the lawn. Besides having a better view and sound, you are protected from the rain which could ruin your experience.
3. The traffic issues will repeat on the way out. Perhaps bring some coffee, non-alcoholic drinks, water and good desserts and have a snack in the parking lot while you wait for things to thin out.
4. Also think about the Metro / bus option. It will be speedier than the parking options and you can just talk with your friends.