i copied this from Nascar.com
3 races total I think, And don't the fans pick whether to invert the field in one of the events?
How it works
The 21st NASCAR NEXTEL All-Star Challenge returns on Saturday, May 21 at Lowe's Motor Speedway, with the winner collecting over $1 million during one of the season's most exciting evenings. The NASCAR NEXTEL Cup Series drivers who will compete that night have earned that distinction. The all-star event showcases race winners from the previous and current NASCAR NEXTEL Cup seasons, plus the winner of the NASCAR NEXTEL All-Star Challenge Open, a preliminary event for teams not qualified for the all-star event, and another Open driver who wins a fan vote into the all-star event