structural:expansion, linguistic:paraphrasing
Iran

In Iran, where the occasion is known as Eid-e-Fitr (Persian: عید فطر), several groups of experts representing the office of Ayatollah Khamenei go to the different zones of the country at the last days of Ramadan to determine the date of Eid. Iranian Muslims take part in the Eid al-Fitr prayer and pay the Zakat al-Fitr. The Eid al-Fitr prayer, and the following sermon, has been led by Ayatollah Seyyed Ali Khamenei, Supreme Leader of Iran, at Tehran 's Grand Mosalla mosque of Tehran (Mossalla). The celebration is typically marked by a one- or two-day national holiday.