National Unity Day in Hungary
National Unity Day in Hungary is held on June 4. Dedicated to the anniversary of the Trianon Treaty. This event in the first decade of the month June is annual. 
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The Day of National Unity, also known as the Memorial Day of the Treaty of Trianon, is a holiday to commemorate a great nemzeti tragédia (“national tragedy” ) that occured as a result of World War I. It’s also an opportunity to reflect on the unity that Hungary was still able to achieve in the face of disaster and igazságtalanság (“injustice”).
The Treaty of Trianon was signed on June 4, 1920, and officially ended hostilities between Hungary and its enemies in World War I. However, the Treaty of Trianon terms caused Hungary to területeket elveszít (“lose territories”) on a massive scale; over seventy percent of Hungary’s territories were to be handed over to other countries.
Similar holidays and events, festivals and interesting facts
Children's Day in Hungary on May 31 (celebrated on the last Sunday in May);
European Siblings' Day on May 31
Teacher's Day in Hungary on June 7 (celebrated on the first Sunday in June);
Inventors' Day in Hungary on June 13
Day of the Independent Hungary on June 19
Father's Day on June 21 (Ñelebrated on the third Sunday of June øò Argentina, Aruba, Canada, Costa Rica, France, Greece, Hong Kong, Hungary, India, Ireland, Kenya, Japan, Macao, Malaysia, Malta, Mexico, Netherlands, Pakistan, Peru, Puerto Rico, Singapore, Slovakia, South Africa, Sri Lanka, Trinidad and Tobago, Turkey, Venezuela, United Kingdom);
Day of Officials and Civil Servants in Hungary on July 1