Eid-ul-Adha is celebrated because Abaraham(PBUH) was asked by God to kill his son,As abaraham tried to kill his son an arch-angle stopped him and instead of his child he gave a sheep to kill.That's...
The actual date depends on the actual sighting of moon and also depends on the geographical location of the person but a rough estimate is November 27, 2009 +/- 3 days.