Protesters will stage a mock oil spill outside an oil industry conference in Adelaide in opposition to planned drilling in the Great Australian Bight.
Local government leaders, traditional owners, fishing and tourism operators and conservationists will deliver their message outside the annual conference of the Australian Petroleum and Production and Exploration Association.
Tuesday's stunt will be directed at Norwegian energy company and offshore operator Statoil, which plans to go ahead with drilling in the Bight by October 2019.
Later on Tuesday, Kangaroo Island Mayor Peter Clements will attend the Statoil AGM in Norway to personally deliver the message opposing the company's plans to its directors and shareholders.
Mr Clements will also read a letter from Kokatha elder Sue Haseldine, telling the company they do not have consent to explore.
"More than half a dozen councils have voted to oppose oil drilling," he said.
"Their opposition is just the beginning - hundreds of thousands of people will not rest until the threat of oil drilling in the Bight has been seen off once and for all."
The APPEA conference and exhibition is being held at the Adelaide Convention Centre from May 14-17.
Speakers will include SA Premier Steven Marshall and federal Resources and Northern Australia Minister Matt Canavan.