Looks like the kentuicky start time was moved back for a night race. Track Manager said it was what was required to provide fans a choice and provide thenm with entertainment they are used to like fireworks and bands.

Bandman:

?

From the front page article.

The time change is what we needed for this event," Kentucky Speedway Executive Vice President and General Manager Mark F. Cassis said. "While we truly benefited and were extremely grateful to be able to showcase our venue and marketplace through the ABC national television broadcasts in past seasons, we think our fans will truly enjoy seeing high-speed Indy cars circling our speedway in the evening.

"A twilight start also will provide us the opportunity to complement the race with elements our fans have come to expect such as a post race concert or fireworks show to create a complete evening of family entertainment."

When 27k fans fail to show up. You have to do something. One, schedule it away from televised NASCAR event. Two, provide a "festive" event that caters to families.