This is from the Jayski web site.
There will be some charity Segway races before Fridays night race featuring Nascar drivers and members of the press. The coverage is on TNT. I'm not 100% sure on the time. Cup qualifying starts at 6:00 ET and Busch pre-race is at 7:30 ET.
Full article on this page
http://www.jayski.com/cupnews.htm