Protesters will take to the streets in Cairns in the hope of putting climate change at the forefront of the minds of finance ministers and central bankers from the world's richest nations.
The second and final day of the G20 finance meeting kicks off in Queensland's tropical north on Sunday.
Supporters of the People's Climate March are expected to gather in the CBD on Sunday morning before making their way to the local convention centre where the meeting is being held.
The march will be the first of a series of rallies organised worldwide to coincide with a United Nations climate change summit in New York next week.
Security is tight in Cairns, with parts of the city in lockdown and an extra 800 police officers, who have additional powers, patrolling the streets.
Two people, aged 18 and 19, were on Friday banned from the CBD after they were caught with laser pointers - one of many items banned within an exclusion zone during the G20.
However, despite it being the first major event since Australia's terror alert level was upgraded, the police beat has been quiet during the event.
Police have said they're aware a protest has been planned for Sunday and have reminded protesters to obey the law.
Treasurer Joe Hockey, who is co-chairing the G20 finance meeting, was met by a group of about 70 peaceful protesters at a Cairns university on Thursday.
Last week, two people pleaded guilty to wilful damage after they were caught writing an anti-G20 slogan using chalk spray on the Cairns esplanade.
A 60-year-old grandmother will also face court on October 1 charged with wilful damage of a pole in a public place by placing an anti-G20 sticker on it.
Security arrangements for the finance meeting are being described as a test run for the G20 leaders' summit in Brisbane in November.
Saturday's discussions concentrated on the global economic outlook, growth strategies and infrastructure investment, leading into a working dinner.
On Sunday the focus will be on global tax recommendations put forward by the Organisation for Economic Cooperation and Development and financial regulations proposals submitted by the international Financial Stability Board.
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