State holidays in Turkey have set dates under the nationally-used Gregorian Calendar, while the Islamic religious holidays are coordinated and publicly announced in advance by the Government's Presidency of Religious Affairs department according to the Lunar Calendar, and are subsequently accommodated into the national Gregorian Calendar, which results in the dates for religious holidays changing every year with a shift margin of approximately 11 days.
Large scale non-Turkish or non-Islamic traditions and celebrations may similarly be called Bayram. Halloween is called "Cadılar Bayramı" ("Bayram of Witches"), Easter is "Paskalya Bayramı" ("Easter Bayram"), Christmas is "Noel Bayramı" ("Christmas Bayram"), Passover is "Hamursuz Bayramı" ("No-dough Bayram"), and Hanukkah is "Yeniden Adanma Bayramı" ("Renewal" or "Rededication Bayram"). Not every special occasion or holiday is referred to as a Bayram; those that are not include World Health Day, and Liberation of Istanbul, among others.[2]
Passover ("Hamursuz" (mean matzah) bayramı, mostly celebrated by Turkish Jews or Jewish minorities and also locally celebrated by some unreligious groups as folk festival)[8]
Easter (It is commonly called "paskalya yortusu“ in western Turkey; some groups in the east call it "Paskalya Bayramı)[9]
Folk festivals
Newroz (“Nevruz Bayramı" or "Ergenekon Bayramı" celebrates the spring equinox.[2]
Hidirellez bayramı is for the start of spring and summer days.
Kosaqan or Yılgayakh - A spring feast and festival Turkic and Altai folklore.
Sayaqan or Yhyakh - A summer feast and festival Turkish folklore.
Paktaqan - An autumn feast and festival Turkic and Altai folklore.
Paynaqan - A winter and pine tree feast and festival in Turkic and Altai folklore.
Nardoqan - Nardoqan or Narduğan was a Turkic-Mongolian holiday for the winter solstice.