Very well Joe, thank you for asking.
Throughout the weekend attendees will at various times race their cars, work on their cars, help others work on their cars, watch others race their own cars, work on and around the track, meet with freinds in the pits, walk around the pits, walk around the car show in the grove, walk around the swap meet, work in the swap meet, eat a meal, take a nap, buy from merchants, or whatever else they may want to do.
But, I will garantee that not all 20-25,000 attendees will all want to sit in the grandstands all at once.
Gino, I was being Sarcastic! I don't believe for a second they had 25,000 or 20,000 for that matter! That track's stands holds maybe 8,000! If you think those pits had another 10-12,000+ people just milling around you must be NHRA's official attendance keeper