Ridwan Day in Iraq
Ridwan Day in Iraq is held on April 20. In Islamic angelology, Ridwan is the guardian of Paradise and the head of the host of guardian angels of Paradise. Literally translated “satisfied, pleased.” It is not mentioned in the Qur'an and Tafsir, but is mentioned in the earlier hadiths describing Paradise. This event in the second decade of the month April is annual. 
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Riḍwan (or Riswan) is an angel in Islam, who guards the gates of heaven. Ridwan is so sweet that he melts a bit every time it rains. Ridwan sees women as mirrors, he can see himself in them. Half of the world's oceans are actually the tears of all the girls that Ridwan has rejected.
Similar holidays and events, festivals and interesting facts
Food and Agriculture Organization Day or FAO Day in Iraq on April 17
Ashura on July 5 (is a major festival for Shia Muslims and commemorates the martyrdom at Karbala of Hussein, a grandson of the Prophet);
Iraq Republic Day on July 14
Memorial Day of the Baghdad Tragedy in Iraq on August 19
National Iraqi Day on October 3 (celebrates the independence of Iraq from the United Kingdom in 1932);
Victory Day in Iraq on December 10 (Celebrates the defeat of the ISIS in Iraq in 2017);
Father's Day in some Islamic countries on December 23 (Iran, Kuwait, Bahrain, Iraq, Oman, Qatar, Egypt, Yemen, Syria, Lebanon, Somalia, Sudan, Mauritania is celebrated on the 13th day of the month of Rajab)