The State Government is taking a cautious approach to Western Australia's Roadmap to Recovery, extending Phase 4 for a further two months.
Following today's announcement from Premier Mark McGowan, the start date for Phase 5 has been pushed back once again to October 24 (effective from 11.59pm on October 23).
As a result, another major event - this year's Perth Royal Show - has officially been cancelled.
The government now intends to work with the Royal Agricultural Society on other shows scheduled for later in the year.
"Given the situation over east and our latest health advice, proceeding to Phase 5 too soon is just not appropriate," Mr McGowan said.
"I know this will cause frustration and problems for some sections of the community, but we are trying to find the right balance here, between protecting our community and keeping our economy as open as possible.
"The decision on the Royal Show will come as a disappointment for many people, but right now we just cannot afford to take an unnecessary risk."
Phase 5 will include the removal of the two square metre rule as well as the removal of the 50 per cent capacity limit for major venues such as Optus Stadium.
The decision was made based on the latest health advice from the state's Chief Health Officer, Dr Andrew Robertson.
Dr Robertson warned that it could take two months or more for the outbreaks in Victoria to be under control.
"While the decision to cancel the 2020 Perth Royal Show will be disappointing for families across the State, we have to put the health and safety of the community first," Dr Robertson said.
"We will work closely with the Royal Agricultural Society to make sure they can deliver a vibrant Perth Royal Show in future years."
