Hidirellez
Hidirellez is held on May 6. Turkey, Azerbaijan, is also celebrated in other Turkic-speaking countries as the day on which the prophets Khidr [al-Khidr] and Ilyas [Ilya] met on earth. This event in the first decade of the month May is annual. 
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Hıdırellez is regarded as one of the most important seasonal bayrams (festivals) in both Turkey and parts of the Middle East. The words Hızır and İlyas have since fused together pronounced as Hıdrellez. Hıdrellez Day falls on May 6 in the Gregorian calendar and April 23 in the Julian calendar, also known as the “Rumi” calendar.
In the folk calendar used by the people, the year used to be divided into two: The period between May 6 and November 8 was summer, called the “Days of Hızır”, and the period between November 8 and May 6 was winter, called the “Days of Kasım”. May 6 thus represents the end of winter and the start of the warm days of summer, a cause for celebration.
Similar holidays and events, festivals and interesting facts
Turkish Armed Forces Day on May 3
Flower Festival in Azerbaijan on May 10
Mother’s Day on May 11 (Anguilla, Antigua and Barbuda, Aruba, Australia, Austria, Bahamas, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bhutan, Bonaire, Botswana, Brazil, Brunei, Canada, Cambodia, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Congo, Dem. Rep., Congo, Rep., Cote d'Ivoire, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Equatorial Guinea, Estonia, Ethiopia, Faroe Islands, Fiji, Finland, Germany, Gabon, Gambia, Greenland, Ghana, Greece, Grenada, Guyana, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Kenya, Latvia, Liberia, Liechtenstein, Macau, Malaysia, Malta, Myanmar, Namibia, Netherlands, New Zealand, Pakistan, Papua New Guinea, Peru, Philippines, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Singapore, Sint Maarten, Slovakia, South Africa, Sri Lanka, Suriname, Switzerland, Taiwan, Tanzania, Tonga, Trinidad and Tobago, Turkey, Uganda, Ukraine, United States, Uruguay, Vietnam, Venezuela, Zambia, Zimbabwe);
Memory of the dedication of Constantinople in Turkey on May 11 (in 330 Constantinople was the capital of the Eastern Roman Empire);
Commemoration of Atatürk, Youth and Sports Day on May 19 (Turkey, Northern Cyprus);
Day of employees of the Ministry of Ecology and Natural Resources in Azerbaijan on May 23 (and the celebration of the Annunciation of the Bab);
Emergency Medicine Day on May 27