In the religion of Islam, 'Id Al-Adha or Eid al-Adha (Arabic ??? ??????, "Festival of the Sacrifice") is a major festival that takes place at the end of the Hajj. It is also known as 'Id al-Qurban or al-'Id al-Kabir (Major Festival). Eid al-Adha marks the completion of the hajj (pilgrimage) rites at Mina, Saudi Arabia, but is also observed by Muslims throughout the world to commemorate the faith of Ibrahim (Abraham).
Eid Al-Adha begins on the 10th of Dhu'l-Hijja, the last month of the Islamic calendar, and lasts for fours days. It begins the day after Muslims on the Hajj descend from Mount Arafat.
Dates
Meaning of the Festival
The festival commemorates Allah's gift of a ram in place of Isma'il (Ishmael), whom God had commanded Ibrahim (Abraham) to sacrifice. (In Judaism and Christianity, the child in this story is Ishmael's brother Isaac.)
The devil tried to persuade Ibrahim to disobey Allah and not to sacrifice his beloved son, but Ibrahim stayed absolutely obedient to Allah and drove the devil away. Eid al-Adha is a celebration of this supreme example of submission to God, which is the cornerstone of the Islamic faith (islam means "submission").
Eid al-Adha Observances
On Eid al-Adha, families that can afford it sacrifice an animal such as a sheep, goat, camel, or cow, and then divide the meat among themselves, the poor, friends and neighbors.

The sacrifice is called Qurban. During the sacrifice, the following prayer is recited:
In the name of Allah And Allah is the greatest O Allah, indeed this is from you and for you O Allah accept it from me. Eid al-Adha is a public holiday in Muslim countries. Like 'Id al-Fitr, 'Id Al-Adha begins with communal prayer at daybreak on its first day, which takes place at the local mosque. Worshippers wear their finest clothes for the occasion. It is also a time for visiting friends and family and for exchanging gifts.
Mass Islamic congregation on Eid al-Adha at Jama Masjid, ...
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https://www.youtube.com/watch?v=cXrB8S0dlIo
شاب أسترالي تمنى الشر للإسلام لكن انتهى به الحال بأن اعتنق الإسلام

https://www.youtube.com/watch?v=_zUUEAHo8hw
عثمان بن فاروق يجيب عن سؤال- ما الفرق بين الكتاب المقدس والقرآن؟
https://www.youtube.com/watch?v=PXPpUjW5zRY
لماذا تستنجون بورق المرحاض وليس بالماء؟ - حوارمنصور مع ملحدين
https://www.youtube.com/watch?v=PT7wSQNoT0o