From the track site...
"As a result of the permit issued by King County Hearing Examiner for the upcoming NHRA Northwest Nationals, no one will be allowed to stay overnight until Thursday, August 3rd. Sportsman stacking will open at 5:00 AM and pit parking will begin at 7:00 AM on Thursday, August 3rd. Teams will need to proceed to the main entrance of Pacific Raceways where officials will guide you to the stack lot (Parking Lot C)."
http://pacificraceways.com/nhra-nati...king-schedule/