The International Quds Day is a legacy of the late founder of the Islamic Republic, Imam Khomeini, who designated the day in solidarity with Palestinians.
Since the 1979 Islamic Revolution in Iran, the International Quds Day has been held worldwide on the last Friday of the Muslim fasting month of Ramadan.
This year, the International Quds Day falls on Friday, May 31.
Here are some posters calling for participation in the Quds Day rallies, according to Press TV: