Eid al-Fitr is the end of the month of Ramadan, a month in which Muslims are required to fast from dawn to sunset and it's on this day that the fasting ends.
Eid al-Adha is a holiday which celebrates Abraham's willingness to sacrifice his son.
It is estimated that 13% of all school children are Muslim and both candidates argue that their religous holidays should be respected and celebrated.
de Blasio: “The origins of this nation people of many different faiths coming together."
Lhota: “We have a growing Muslim community in the city of New York, and their religion needs to be respected as all other religions are respected.”
It is unlikely that Muslims will get equal treatment that Christians get. Back in 2010, NYC high schools gave a test to it's students which included 9 questions on the spread of Christianity, Buddhism, and Islam. The questions on Buddhism were neutral, while the questions on Christianity were nothing more that blatant attacks. However, the questions on Islam are positive and boosts Islam as far superior to Christianity.
The test was written by John Esposito, a Georgetown professor and longtime Muslim apologist. He is famous for refusing to even read anything about Islamic violence. Here is a quote from him:
“Merchants were carriers of Islam rather than agents of Islamization…Muslim men of religion were peacemakers.” – John L. Esposito, ed., The Oxford History of Islam, Oxford University Press
Ibn Ishaq, Sirat Rasul Allah (The Life of Muhammad), A. Guillaume, tr. (New York: Oxford University Press, 1980), p. 369:
The apostle said, "Kill any Jew that falls into your power." Thereupon Muhayyisa bin Mas’ud leapt upon Ibn Sunayna, a Jewish merchant with whom they had social and business relations, and killed him. Huwayyisa was not a Muslim at the time though he was the elder brother. When Muhayyisa killed him Huwayyisa began to beat him, saying, "You enemy of God, did you kill him when much of the fat on your belly comes from his wealth?" Muhayyisa answered, "Had the one who ordered me to kill him ordered me to kill you I would have cut your head off." He said that this was the beginning of Huwayyisa’s acceptance of Islam. The other replied, "By God, if Muhammad had ordered you to kill me would you have killed me?" He said, "Yes, by God, had he ordered me to cut off your head I would have done so." He exclaimed, "By God, a religion which can bring you to this is marvelous!" And he became a Muslim
And this became the central theme behind the spread of Islam. Islam was spread by conquest. Even the "evil" crusades were Christians trying to take back land that the Muslims had stolen by conquest. But you don't hear anyone complaining about the conquest, only the efforts to reverse it.