I used to live in that part of Prince William county and two of my kids graduated at Jiffy Lube Live.
The parking lots are dirt/rocks, so if it is raining, your shoes will get wet and muddy. So be prepared to wear something you are ok with getting wet.
Once you are seated, there should be plenty of seating for everyone to be covered. We had no problem seeing our kid on stage.
With only 250 graduates, getting in and out of the parking lot should not be so bad (unlike concerts.)
Congratulations to your graduate!
