Slavonic Writing and Culture Day in Bulgaria
Slavonic Writing and Culture Day in Bulgaria is held on May 24. This event in the third decade of the month May is annual. 
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Day of Education and Culture of Bulgaria, and Slavic Literature is a Bulgarian holiday, which is celebrated on May 24. On this day in Bulgaria celebrates Education and Culture of Bulgaria and the creation of the Glagolitic alphabet of Cyril and Methodius.
In the 9th century there were two Greek-Bulgarian missionary brothers named Cyril and Methodius (Kyril and Metodii in Bulgarian). Cyril was a great philologist and both he and Methodius had experience in diplomatic and Christianization missions in pagan lands.
Prince Ratislav I of Moravia commissioned both brothers to evangelize his territory in the Slavic language, and to carry out their mission Cyril and Methodius created the Glagolitic alphabet (the version prior to Cyrillic). Thus they were able to translate the Bible into Old Slavonic and begin to evangelize, first in Great Moravia and later in the rest of the Slavic countries.
Similar holidays and events, festivals and interesting facts
Saints Cyril and Methodius Day in Bulgaria on May 11
Feast of Elijah on July 20 (Catholic Church, Eastern Orthodox Churches, and the Lutheran Church–Missouri Synod);
Beginning of the Orthodox Church Year on September 1
Unification Day in Bulgaria on September 6
Nativity of the Virgin Mary on September 8
Bulgaria Independence Day on September 22 (celebrates the independence of Bulgaria from the Ottoman Empire in 1908);
Bulgaria Air Force Day on October 16