You can use Eid Al-Adha (Greater Bairam). It lasts for 4 days and it is when millions of Muslims perform Hajj (Pilgrimage). They travel to Mecca in Saudi Arabia to perform Hajj retuals. They are also required to sacrifice a sheep and to give one third if it to the poor, one third to friends and neighbors and the last third is for the person who sacrificed the sheep (this is related to the story of Ibraham and Ismail, his son. When Ibrahim was supposed to sacrifice Ismail after a vision which he saw during his sleep. God sent down a sheep to be sacrificed insted of Ismail. Thus those who are financially able are required to sacrifice a sheep every year). Aslo people are required to wear something new, it doesn �t have to be expensive or extravagant. A simple thing will do. This holiday starts with a prayer which most Muslims perform in congregation early morning of the first Eid day. So I suggest that you use words like: