Eid al-Adhaa (The Festival of Sacrifice)
Question

                what is Id al-Adha, The festival 
of sacrafice. my daughter is doing a homework assignment 
I need as much info or where else to look as soon as possible?
Praise be to Allah.Eid al-Adhaa is the tenth day of Dhoo’l-Hijjah, the last
    (twelfth) month of the Hijri or Islamic calendar. It is, as the Prophet 
 (peace be
    upon him) said: “The greatest day in the sight of Allaah, may He be blessed and
    exalted, the Day of Sacrifice . . .” (Reported by Abu Dawud; see also Saheeh
    al-Jaami‘, 1064).
It is also the greatest day of Hajj, as the Prophet 
 (peace be
    upon him) told us. (Reported by al-Tirmidhi, see Saheeh al-Jaami‘, 8191).
The reason why it is described as the greatest day of the year is
    that it combines so many acts of worship which are not combined on any other day, such as
    the Eid prayer, offering the sacrifice, reciting Takbeer (glorifying Allaah), and
    widespread remembrance of Allaah. For the pilgrims in Makkah, it also includes offering a
    sacrifice, stoning the pillars representing Shaytaan (the devil), shaving the head (for
    men only; women merely cut a little off their hair), and performing Tawaaf
    (circumambulation of the Ka‘bah) and Sa‘ee (running between the two hills
    of Safaa and Marwa).