Chilcott's plea comes ahead of a national caucus this weekend of all left-faction delegates to the ALP national conference.
When the convention deadlocked between the conservative Stalwart and liberal Half-Breed factions, delegates turned to dark-horse candidate James A. Garfield, and Arthur was nominated vice president as a conciliatory gesture to Conkling and the Stalwarts.
An effort to block Trump's nomination at the Republican convention attracted a significant faction of delegates but failed days before the convention began.
Left faction-aligned delegates, union representatives and activists met in Sydney on Saturday and Sunday to discuss key issues ahead of the national conference, which will take place in Melbourne from 24 to 26 July.
May is also critical of the long-running practice of factions, whereby delegates with similar views agree to support a particular candidate in order not to split the vote.
The factional representation at the forthcoming conference will be the most finely balanced in many years, with the left expecting to have about 196 delegates, while there will be about 197 delegates aligned to the right faction and four unaligned delegates.
As per divorce caucus rules, Denise and I are not allowed to stump for ourselves, so each faction must appoint a delegate to speak for the group.
Some 350 delegates including faction leaders, government officials and civic groups are due to gather over the coming weeks in the Kenyan town of Eldoret for the conference, which follows a series of failed peace initiatives.
The discord in Philadelphia, however, has so far failed to match the intra-party chaos in Cleveland, where one of the biggest Republican speakers refused to endorse Trump and a faction of anti-Trump delegates launched a last-minute unsuccessful coup to rob him of the nomination.
Mr. Buchanan's moment of triumph as a nominee -- if not yet the nominee -- of a party he only joined last year after bolting the Republicans came after delegates in the faction supporting him voted almost unanimously to throw out a monthlong primary, in which fewer than 80,000 had bothered to participate, in favor of a vote by delegates.
