Safaa and Marwaa
These are the two hills which the mother of Ishmael ran between and stood upon while searching for provisions and water. In Hajj, people walk and run between these two hill in adherence to the teaching of the Prophet 
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Jamaraat
These are the places that Satan approached Abraham when he left his wife and son in Makkah, in order to make him hesitate from acting upon Allah’s orders. He took a few stones and pelted Satan. During Hajj, Muslims throw stones at these pillars, in adherence to the Sunnah of their father, Abraham. They proclaim Satan an open enemy who must be resisted. This is done by resisting the satanic desires and obeying the commands of Allah and abstaining from the prohibitions.
Muslim’s Eid Celebrations
Muslims have two annual religious holidays. Eid al-Fitr is celebrated at the end of the Month of Ramadan, and it signifies the end of the Fasting season. The second Eid festival is called Eid al-Adha, because Muslims seek nearness to Allah by slaughtering sacrificial animals in adherence to the example of our father Ibraheem. He saw in a dream that he was sacrificing his son Ishmael, and the dreams of the Prophets are true. When he was about to sacrifice his son, Allah said: 
So We gave him good tidings of a forbearing boy. And when he reached with him [the age of] exertion, he said, ‘O my son, indeed I have seen in a dream that I [must] sacrifice you, so what do you think.’ He said, ‘O my father, do as you are commanded. You will find me, if Allah wills, of the steadfast.’ And when they had both submitted and he put Ishmael down upon his forehead. We called to Abraham, ‘O Abraham you have fulfilled the vision.’ Indeed We thus reward the doers of good
(37:101-105)