Official Holidays in Turkey

Official Holidays
Jan 1: New Year's Day

National Holidays
Apr 23: National Sovereignty and Children's Day (Anniversary of the establishment of Turkish Grand National Assembly)
May 19: Ataturk Commemoration and Youth & Sports Day (Arrival of Ataturk in Samsun, and the beginning of the War of Independence.)
Aug 30: Victory Day (Victory over invading forces in 1922)
Oct 29: Republic Day (Anniversary of the declaration of the Turkish Republic)

Religious Holidays
Seker Bayrami: Three-day festival to celebrate the end of the fasting month; Ramadan.
Kurban Bayrami: Four-day festival when sacrificial sheep are slaughtered and their meat distributed to the poor.

(The dates of these religious festivals change because of the difference between the Muslim lunar calendar and solar calendar.)