The three-day Biswa Ijtema drew the highest number of people, including 5,000 foreigners from 50 countries, on the last day of the first phase of congregation today.
The event was concluded with a closing prayer or "akheri munajat" by Indian cleric Maulana Saad, who prayed for the return of peace in Bangladesh and elsewhere in the world.
Since 2011, the Ijtema has been held in two phases to accommodate the large number of devotees.
Prime Minister Sheikh Hasina took part in the prayers from her Ganabhavan official residence, officials told PTI.
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The ijtema, staged annually by the New Delhi-based World Tablig Jamaat since 1964 in Bangladesh, draws crowds in huge number, earning the event the reputation of being the world's second largest Muslim congregation after the Haj.
Bangladesh Nationalist Party (BNP) earlier declined to ease its non-stop nationwide strike to facilitate the Ijtema despite its general image as a pro-Islamic party and appeals from organisers as well as the ruling Awami League of Hasina.
Zia, however, took part in the akheri munajat from her office as the TV channels broadcast live the concluding prayer of the congregation, the ex-premier's press officials said.
"Derailments of trains in the last three days have had an impact on the service and schedule," a railway spokesman said.
His comments came as reports about the headmaster of a government primary school in the northwestern Gaibandha succumbed to his wounds yesterday at a local hospital, raising the violence toll to 11 since January 5.