They included an official ceremony held at the mausoleum of Imam Khomeini, the late founder of the Islamic Republic, south of Tehran.
Political, religious and military officials, leaders of different faiths and various groups of people attended the ceremony.
It began with recitation of verses from the Holy Quran by eminent qari Habib Sedaqat and then the national anthem of the Islamic Republic of Iran was played.
The ceremony also included eulogy recitations performed by Mahmoud Alavi in praise of Ahl-ul-Bayt (AS), the martyrs of the Islamic Revolution and Imam Khomeini.
Next, Hojat-ol-Islam Mohammad Hassan Aboutorabifard, an interim Friday prayer leader of Tehran, delivered a speech in which he described Imam Khomeini (RA) as a figure who was raised in the school of the Holy Quran.
He added that Imam Khomeini was a great personality who had found the path of truth and spent his life on doing good deeds.
Every year, millions of Iranians across the country observe ten days of celebrations marking the anniversary of the victory of the 1979 Islamic Revolution that put an end to the monarchy of the US-backed Pahlavi regime in the country.
The day of Imam Khomeini’s return to Iran (February 1 this year) marks the beginning of the Ten Day Fajr (Ten Days of Dawn), which culminates with rallies on the anniversary of the victory of the Islamic Revolution on February 11.
The Iranian nation toppled the US-backed Pahlavi regime 42 years ago, ending the 2,500 years of monarchic rule in the country.
The Islamic Revolution spearheaded by the late Imam Khomeini established a new political system based on Islamic values and democracy.