Indonesian presidential candidate Prabowo Subianto has addressed around 1000 Muslim supporters, despite being advised against making the wait for an official election result any more tense.
Both Mr Prabowo and his rival Joko Widodo claimed victory after Wednesday's election, using different data to support their bids.
The stand-off means more than 130 million ballot papers must now be counted, with the official result due by July 22.
After both men claimed victory, President Susilo Bambang Yudhoyono summoned them separately to his home and urged them to refrain from rousing supporters in this tense period.
On Friday afternoon, Mr Prabowo fronted a rally for solidarity with Palestine, in Jakarta's city centre.
He pledged a Rp 1 billion ($A91,860) donation and then turned to themes from his campaign speeches.
"We have to increase solidarity among us so that we don't clash with each other, so that we are not divided by the power of colonialists," he said.
Mr Prabowo was commended to the cheering crowd as "the new president".
Among them were members of the radical Indonesia's Islamic Defenders' Front (FPI) who chanted "Jihad! Jihad!"
Flags for jihadist group ISIS and radicals Hizb ut-Tahrir, who believe in the re-establishment of caliphate, were also waved in the crowd.
Meanwhile Mr Joko spent Friday doing media interviews and meeting representatives from mainstream Islamic organisation Muhammadiya.
He was not expected to attend an evening event in Jakarta where his supporters planned to light 1000 candles for Palestine.
The "quick count" results Mr Joko is relying on have accurately predicted the results of Indonesian national elections since 2004.
Those tallies give the cleanskin Jakarta governor a 53-47 lead.
Mr Prabowo was an army general in the Suharto era who has admitted ordering the abduction of democracy activists before the strongman's downfall.
He is staking his claim on data from less well-known polling agencies, which have links to his coalition.
Both men have urged supporters to be vigilant for interference during the vote-counting process.
The official count can be challenged in the constitutional court, which must declare a winner by August 24, ahead of the inauguration of a new president in October.
Analysts believe that Mr Joko, known by his nickname Jokowi and seen as a break from the autocratic Suharto era, has the more credible claim to victory, and as such is the most vulnerable to being targeted by such fraud.
Both camps have sent hundreds of thousands of monitors to watch the ballots' each and every move in a country where vote-buying and the bribing of government officials is rampant.
"The most vulnerable part of the Indonesian election is the counting process," Jakarta-based independent analyst Paul Rowland said.
For transparency, votes are counted in public at polling stations, sometimes in front of large crowds and party witnesses.
The votes are tallied on a form visible to onlookers, then handed to village chiefs before being collected at a higher administrative level and eventually making their way to Jakarta.
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