Security was tight and the protest group was kept well away from the military strongman who is the self-appointed leader of Fiji and has formed his own political party to contest the polls scheduled for September 17.
There was a brief clash before his arrival at the rally as opponents called out that he was a dictator while supporters said he was a good man.
Opposition parties in Fiji have accused Bainimarama's military regime of stacking the deck against them with ongoing changes to election regulations.
During his speech, Bainimarama said that since overthrowing the government in a bloodless military coup in 2006 he had instituted a rule that was not based on race.
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Afterwards he refused to take questions from journalists.
Fiji has experienced four coups since 1987 stemming from tensions between indigenous Fijians and ethnic Indians descended from sugar plantation labourers shipped in by the British during the colonial era.
Latest opinion polls in Fiji show 60 per cent support for Bainimarama to be the legally elected prime minister.