Muharram (Islamic New Year)

Muharram (Al-Hijra - Islamic New Year - begins at sundown)
The Islamic New Year begins on the first day of the first month (Muharram) of the Islamic calendar and is known as 1 Muharram. It is generally observed with quiet reflection and prayers.

sources:
New Year on the Net - When January 1st isn’t New Year’s Day
Al-Hijra: Islamic New Year

Eid-Al-Fitr (Celebrating the Fast - Islamic)
Almost two billion Muslims around the world celebrate Eid ul-Fitr (eed al-fitter), the three-day festival commonly known as “Eid.” “Eid ul-Fitr” literally means “the feast of the breaking/to break the fast.” The holiday marks the end of Ramadan, the holy month of fasting and is a culmination of the month-long struggle towards a higher spiritual state.

source: Ramadan on the Net - Eid ul-Fitr

photo credit: EID Prayers - Ashish T via flikr

Latest Ramadan Update:

According to our sources at Moonsighting.com, and it very much depends on where in the world you are living, Ramadan is expected to begin September 13th.

UPDATE:
The Religious Authority, Sayyed Muhammad Hussein Fadlullah, issued a statement announcing that the … first day of the month of Ramadan.

He said:

Based on accurate astronomical calculations that we trust (the birth of the crescent and the ability to see it), it has been jurisprudentially proven to us that next Thursday will mark the beginning of the Holy month of Ramadan across the world, including the countries in the Far East such as Australia and New Zealand.

source: Sayyed Fadlullah: Thursday is the first day of the month of Ramadan

For more Ramadan information please visit Ramadan on the Net

Isra Al Mi’Raj (Ascent of the Prophet Muhammad - Islamic)*
Commemorating the Prophet Muhammad’s journey to Jerusalem and his ascent into heaven where he prayed together with Abraham, Moses, and Jesus. 

*US date. Date may vary depending on where one lives in the world.