Islam is one of the worlds five major religions.
Islam is centered on the teachings of the Prophet Muhammad and the Koran,
the holy book of Islam.
Islam has two major religious festivals. They are Id-al-Fitr, and Id al-Adha. Id al-Fitr, more commonly called Id, is celebrated at the end of the month of Ramadan-the ninth month of the Islamic calendar. Id al-Adha is celebrated at the end of the Hajj-the religious pilgrimage. Ramadan and the Hajj are not really festivals, but are basic duties of all Muslims.
Some of the other Islamic holidays are Lailatul Qadr (The Night of Power), Milad-an-Nabi (Birthday of the Prophet), Lailatul Baraat (Night of Deliverance), Lailatul Miraj (The Night of the Ascent), and Muharram (New Years Day).
On a festival day, most Muslims to go to a mosque to celebrate the festival. There are no dietary restrictions during most festivals, but during the month of Ramadan, all Muslims are required to fast. On other festivals, some kind of cattle, usually sheep, goat, or lamb is prepared as the main course. This specially prepared meat is called Halal.
Below are links to the Islamic festivals.
Above: An example of a prayer rug. Most Muslims sit on one of these while saying their prayers.