Betting suspended on The Everest horse race before Sydney Opera House show

NSW Racing Sydney

Some 240,000 people have now signed a petition calling for the promotion to be stopped. "I hear loudly what people have said about the Opera House", she said. "They've even called for the sacking of the Opera House manager who told them where to get off. Let's remind Alan that the Opera House truly does belong to everyone, by supporting Louise Herron's staunch defence of one of our city and country's few instantly recognisable heritage landmarks".

Hundreds of Australians flickered torches on Tuesday at the sails of Sydney's Opera House, aiming the light rays to disrupt horse-racing advertisements projected on its facade, in a protest against the use of the building to promote gambling.

"The Opera House guidelines have from time to time been amended, whether it's for other sporting events or other causes".

Herron was appointed CEO of the Sydney Opera House in 2012, having previously been a lawyer and corporate adviser, and was chair of Sydney's Belvoir Street Theatre for 10 years.

"I seriously doubt Alan would go to the trouble of getting in touch but you never know".

Estimates put last night's crowd as high as 3000, including many onlookers.

The Everest is a Group 1 thoroughbred sprint race over 1200m, worth $13 million in prizemoney.

It falls in the middle of Melbourne's marquee Spring Racing Carnival, a strategic move by Racing NSW who have ambitions to drag money and attention from Victoria.

Protesters have come out in droves in an attempt to foil a campaign to project the The Everest race's barrier draw onto the Sydney Opera House.

Despite the numbers of beams coming from the ground, the strength of the imaging shone through. Racing NSW boss Peter V'Landys says, however, that Jones has "absolutely no financial interest" in the Everest.

The debate has raged since Friday, when broadcaster Alan Jones called for Ms Herron to be sacked in a fiery on-air interview, and became an argument about balancing the promotion of NSW against using the iconic building's sails for commercial purposes.