Racing NSW says bets have been suspended "to avoid any perceived integrity risk", with waging operators to be informed later this evening when they can recommence betting on the annual racing event.
They then shone bright lights onto the barrier draw results and from across the other side of Circular Quay, the numbers of the race horses displayed on the heritage building were obscured.
The protest is in response to the NSW government's decision to override an earlier ruling by the chief executive of the Opera House, Louise Herron, who did not want to project horse names and branding on the building's sails.
Police in riot gear were in attendance as people began to filter into the areas surrounding the landmark ahead of the controversial illumination, which kicked off at 7.30pm on Tuesday night.
Some attendees held signs slamming the NSW government and Premier Gladys Berejiklian. He cut her off immediately as she attempted to explain the heritage listing of the Opera House and then said he would be calling the Premier.
"Our house is a precious gift to the world", Mr Hall said.
Taylor Swift inspired 65000 people to register to vote, says Vote.org
Taylor Swift made her political preferences public for the first time this week and it seemingly sparked mass voter registration. For a lot of us, we may never find a candidate or party with whom we agree 100% on every issue, but we have to vote anyway.
"This is one of the biggest events of the year... why not put it on the biggest billboard Sydney has?" said Australian Prime Minister Scott Morrison.
The effect of the protesters' lights was varied.
The crowd also chanted against radio shock jock Alan Jones, following his interview of Opera House CEO Louise Herron on Friday in which called for her to be sacked for opposing Racing NSW's plans.
"I don't believe my words or actions qualify as those of a bully or a misogynist but there are clearly many people who do", Jones said on 2GB.
In fact, ABC's the Chaser has already staged its own protest, posting a video to Twitter of themselves driving around Sydney projecting "Advertise here - call Alan", and listing what is apparently Jones' real phone number, onto the Opera House, the Art Gallery of NSW and state parliament.