The mourning ceremony of Imam Ali (PBUH) was held by tens of thousands of people at different cities of Iran, including Hamadan, Zahedan and Aran and Bidgol.

Iran Press/Iran news: On Sunday night, which was the second ‘Laylat al-Qadr’ -the night of destiny- people held the mourning ceremony for the martyrdom of Imam Ali (Peace be Upon Him) at different cities of Iran. 

In Aran and Bidgol -a city near Kashan- lots of people gathered in the holy shrine of Hilal ibn Ali (Peace Be Upon Him), one of the sons of Imam Ali (PBUH) to mourn for Imam Ali (PBUH) and also pray for God's mercy, Iran Press Reported.

Imam Ali (PBUH) was the first Imam and the rightful immediate successor to Prophet Muhammad (PBUH) in Shia belief.

The people in Zahedan also attended Imam Ali (PBUH)'s martyrdom ceremony at their city. 

Muslims believe that on this night, the blessings and mercy of God are abundant, sins are forgiven, supplications are accepted, and that the annual decree of humans is revealed to the angels who also descend to earth, especially the Angel Gabriel, referred to as "the Spirit", to perform every and any errand decreed by God.

Also, large groups of people held Imam Ali (PBUH)'s martyrdom ceremony at the city of Hamadan.

Laylat al-Qadr is definitely one of the nights of the last ten days of Ramadan Month, but there is no certainty which night is Laylat al-Qadr so Muslims hold the ceremony on the nights of 19th, 21st, and 23rd of Ramadan Month, which have the highest chance of being the night. 104/214

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Mourning ceremony for Imam Ali (PUBH) at his daughter holy shrine