TDFR Republic Day in Azerbaijan and Armenia
TDFR Republic Day in Azerbaijan and Armenia is held on May 28. Celebrates the declaration of independence of the First Republic of Armenia and the Azerbaijan Democratic Republic from the Transcaucasian Democratic Federative Republic in 1918. This event in the third decade of the month May is annual. 
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Most of the South Caucasus had been absorbed by the Russian Empire in the first half of the nineteenth century. With the outbreak of the First World War in 1914, the Caucasus became a major theatre, the Russian and Ottoman Empires fighting each other in the region. The 1917 February Revolution saw the demise of the Russian Empire and the establishment of a provisional government in Russia. The Transcaucasian Democratic Federative Republic (TDFR; 22 April – 28 May 1918) was a short-lived state in the Caucasus that included most of the territory of the present-day Armenia, Azerbaijan and Georgia, as well as parts of Russia and Turkey.
Similar holidays and events, festivals and interesting facts
Victory Day of the Battle of Sardarapat in Armenia on May 26 (the battle of the First World War, which took place on May 21-24, 1918 between the Armenian military units and the Turkish troops invading Eastern Armenia);
Armenia First Republic Day on May 28
The Day of Protection of Children Rights in Armenia on June 1
Civil Aviation Day in Azerbaijan on June 2
Melioration Day in Azerbaijan on June 5 (Reclamation Day);
Day of Memory for Repressed People in Armenia on June 14
National Salvation Day in Azerbaijan on June 15