Media captionSo how does a G20 summit work?
Summing up discussions among G20 finance ministers and senior officials over dinner in Buenos Aires, Finance Minister Taro Aso said, "The world economy is basically stable, but there are many uncertainties in the outlook, an example of which is (the slowdown of) China".
President Donald Trump raised the prospect of slapping a 25 per cent tariff on imported cars and ordered a review of China's retaliatory auto tariffs against the U.S.as his administration continued to scramble to respond to General Motors Co.'s announcement of plant closures this week.
Hopes of progress over tariffs in Mr Trump's expected talks with Chinese leader Xi Jinping have been dampened.
However, US tariffs are set to ramp up unless the two leaders can come to an agreement on trade.
Saudia Arabia has denied that Crown Prince Mohammed bin Salman played a role in Khashoggi's gruesome slaying.
Who may have a "couple of extra hours" free at the summit?
The cancellation coincided with a new eruption in the controversy over Russian meddling in the 2016 USA presidential election - an issue that also flared up when the pair held their only summit to date, in Finland in July.
President Trump on Tuesday threatened to cancel an upcoming meeting with Russian President Vladimir Putin after the nation fired at Ukrainian naval vessels and seized multiple ships and their crews over the weekend.
Mr Putin, he said, "is ready to have contacts with his American counterpart".
In an interview with Argentine daily La Nacion, the French president warned against the risk of "a destructive trade war for all".
President Trump said recently that current tariff levels on $200bn (£157bn) of Chinese imports would rise as planned.
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Trump has already rattled global markets by enacting tariffs on the bulk of Chinese imports, and is threatening to go further in January.
"We want the G20 to be a mechanism for dialogue between the major worldwide players", Faurie told Xinhua in the lead-up to the 13th G20 summit, which is scheduled for Friday and Saturday in Buenos Aires.
Morrison has been previously sympathetic to the US tactics, saying at the recent ASEAN summit in Singapore that he supported the aim of what Trump was trying to achieve - fair and free trade - and therefore did not necessarily regard the tariffs as protectionism per se.
The report said the possible new talks would focus on trade "architecture", a broad term that could encompass many issues Washington wants Beijing to address, including intellectual property protection, coerced technology transfer, subsidies to state-owned enterprises and cyber-espionage.
It is to be the crown prince's first significant appearance overseas since the killing.
British Prime Minister Theresa May has said she will meet the crown prince and deliver a "very clear" message. He has also said that he thinks the US and China will reach an amicable trade agreement.
Just what is the G20?
Argentine public organizations have also taken part in the demonstrations, with the rally hosted by activist group MOCASE Via Campesina having brought together about 50,000 people at a stadium.
The G-20 groups Argentina, Australia, Brazil, Britain, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Mexico, Russia, Saudi Arabia, South Africa, South Korea, Turkey, the United States and the European Union.
A professor serving as a journalist at the G20 presidential summit has been the victim of an assault days before the start of the high-level meeting.
The pact must still be approved by politicians in all three countries.