A large number of people from all parts of the country and those including the workers and office bearers of Pakistan Peoples Party (PPP) are participating in the Quran Khawani.
A big public meeting would also be held here later in the day to mark the occasion.
Camps have been set up for the people who have come here to participate in the fourth anniversary of Shaheed Mohtarma Benazir Bhutto.
Strict security arrangements have also been made on the occasion.
Meanwhile, on the eve of the fourth death anniversary of Shaheed Mohtarma Benazir Bhutto, President Asif Ali Zardari had visited the grave of the former prime minister here on Monday.
He had laid floral wreath, offered Fateha and recited verses from the Holy Quran.
The President had also visited the grave of the founder of Pakistan People's Party (PPP) Shaheed Zulikfar Ali Bhutto, laid floral wreath and offered Fateha.
He also visited the graves of Madar-i-Jamhoriat Begum Nusrat Bhutto, Shaheed Murtaza Bhutto and Shaheed Shahnawaz Bhutto, laid floral wreaths and offered Fateha.