It is an Islamic holiday that marks the end of Ramadan, the month of fasting. Fitr means “to break” and therefore symbolizes the breaking of the fasting period and of all sinful habits. The detail of the significance of this holiday and its celebration I’ll simply leave to wikipedia to explain.
To the muslims, this could mean a very special day. To non-muslims like us, though, especially living in this Muslim country, it means a long weekend, a long holiday, a long rest…. ahhhhhh!
From October 20th to 28th, 2006, work day is only on the 26th. Regular office days resume on the 29th.