Suprised the conversation hasn't continued on about this:
http://www.drf.com/news/article/111140.html
"We tried to do everything in a timely manner, based on when we were first informed of the riders' decision not to go out on the turf," said Dunn. "The only other option was to cancel the race entirely, which wouldn't have been fair to all the owners, trainers, and other people who did prepare for and finally participate in the race."
Dunn said he is looking into the possibility of adopting a rule similar to that which exists in New York to cover the situation. That rule essentially makes all bets placed in multi-race wagers an "all" when a surface switch goes into effect.
"In my personal opinion, not having spoken to anybody else here in management or mutuels, this is an idea worth pursuing and I've already asked for a copy of the New York rule to be sent down for us to look at," he said. "Then it would be a matter of approaching the Division of Parimutuel Wagering to get the existing rule changed."