Braving a scorching sun, the followers of a top Sufi leader gathered in the streets near Dhaka's main commercial district as speakers exhorted tolerance for other Muslims and members of different faiths.
Sufism is an offshoot of mainstream Islam whose followers are often denounced as "infidels" in Bangladesh for their mystical traditions, including worshipping at shrines.
"If anyone does good work and has faith in the God, he'll be blessed by Him. It does not matter whether he's a Muslim, Jew or a Christian," Mohiuddin Khan Faruqi, one of the speakers said.
Security was tight as police vans patrolled the streets and organisers set up nearly a dozen check-posts to search people who entered the venue.
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Fourteen Sufis have been murdered since December 2013 in religiously motivated attacks.
"I've heard militants have killed Sufi leaders. But I am not afraid," said Azizul Haq, 55, a farmer, who travelled from a town located 150 kilometres north of Dhaka.
"By following Sufism, I've become a good human being. Sufism is the rightful path," he said.
Abul Kalam Azad, a spokesman for the Sufi congregation, told AFP that the extra security was due to "the recent attacks" on minorities by Islamist extremists.
Islamists have claimed responsibility for around 40 killings in the last three years of foreigners, secular bloggers, gay activists, Hindus and Christians and Sufis. Many have been slaughtered with machetes.
Most have been claimed by the likes of homegrown Jamayetul Mujahideen Bangladesh (JMB) or international jihadists such as the Islamic State organisation or Al-Qaeda's South Asia wing.