With 565,000 spectators expected this weekend, the existing Formula One benchmark is set to be smashed.
Clark called last year’s incident at Oakmont the “lowest point” of his career.
De Allende has been a mainstay of South Africa’s successive World Cup triumphs.
Brook was previously involved in a late night altercation with a bouncer the night before an ODI in Wellington last November.
John and Thady Gosden-trained four-year-old went close to royal success in Duke of Edinburgh.