Dhu-al-Hijjah is the month of pilgrimage,the Hajj which is one of the five pillars of Islams,obligatory on all Muslims who are of age,have the health and wealth to do so.It consists of elements from the time of the Prophet Ibrahim (AS).
It begins from the 8th of Dhul-Hijja till the 12th corresponds to (24th October of this year).They are quiete a few rites that are performed during Hajj,an since I am no scholar you better refer to a good book on Hajj.Again, Hajj shows equality amongsts Muslims of all caste and races,and is an act of submission to Allah.
After Ramy al-Jamarat (Stoning of the devil), is the slaughtering of the animal,to symbolise the mercy Allah had on Propher Ibrahim (AS) by replacing his son with a ram,that was then sacrificed.After this Muslims all around the world celebrate Eid-ul-Adha (Feast of the Sacrifice) or Bakra Eid (Bakra=Goat),which lasts for three days.
Those who have not performed the Hajj,will also offer the sacrifice,which is then divided into 3 parts,one for the family itself,other for neighbours or relatives and the last one for the needy.Oh and the days of the Hajj,people who aren't able to perform it ,can spend their time fasting,reading the Quran all of which is very rewarding.
****Disclaimer: I am no scholar,this was just to enlighted my readers ,if you wish to seek Islamic guidance,do go for more authenticated sources.****