Ticket sales will stop after Friday, further limiting the number of people who will attend, IMS said in a news release.
The Indianapolis 500 is scheduled for Aug. 23.
Bank of America has joined the effort by making a $250,000 gift toward the challenge.
INDIANAPOLIS (WISH) -- The month of August will [...]
Testing will begin May 26, two days after the Indianapolis 500 was scheduled to be held.
"It's definitely going to take more effort now to, to kind of become entertaining to people without a race suit and the helmet on," said Alex Rossi.
Drivers are vying for the coveted "Fast Nine" positions today, with specific positions settled tomorrow.