World Finals from The Dirt Track at Charlotte. Sprints, Late Models, and Big Block Modifieds.
http://auto-racing.speedtv.com/article/woo-speed-to-air-four-hours-of-woo-world-finals/

http://www.worldofoutlaws.com/sprint/

The biggest event of the year(sold out) at The Dirt Track has brought a truly international crowd to the lightning-fast, four-tenths-mile clay oval for the three-day event this weekend. Fans from as far away as Australia, New Zealand, the United Kingdom and eight Canadian provinces are joining fans from 48 states to witness “The Greatest Show on Dirt.”

http://www.charlottemotorspeedway.com/dirt/

How many does this place seat? It is a half mile?

I think around 15,000. Kind of a shitty track for sprint cars, but it is a great facility. I believe Knoxville seats 30,000 +