24th of May is the day in which we celebrate the creation of the Bulgarian script, known outside of Bulgaria as the Cyrillic alphabet.
The Byzantine scholars St. Cyril and Methodius craeted the Glagolitic alphabet around 862-863 so they can spread Christianity. According to our schools, it wasn’t too convenient to use. Their students, based in the Preslav Literary School, did multiple simplifications and created the new script based on the Greek letters with some Glagolitic. The result stuck and spread around the globe.
24th of May is an official holiday in Bulgaria. The video above shows the students and teachers from a local school entering the center of Blagoevgrad with their marching band to be later greeted by the president.