Gibraltar National Day
Gibraltar National Day is held on September 10. Gibraltar is a British Overseas Territory at the southern tip of the Iberian Peninsula commemorating the first sovereignty referendum in 1967. This event in the first decade of the month September is annual. 
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Gibraltar is a heavily fortified British air and naval base that guards the Strait of Gibraltar, which is the only entrance to the Mediterranean Sea from the Atlantic Ocean. Since the 18th century, Gibraltar has been a symbol of British naval strength, and it is commonly known in that context as “the Rock.”
Similar holidays and events, festivals and interesting facts
Day of the Victims of Holocaust and of Racial Violence in Slovakia on September 9
Catalonia National Day on September 11
National Day of Service and Remembrance in United States on September 11 (September 11 attacks-related observances);
Day of Remembrance of Salvador Allende in Chile on September 11 (The anniversary of the 1973 military coup);
Commemoration of the mass hanging of the Saint Patrick's Battalion on September 12
Día de los Niños Héroes in Mexico on September 13 (in memory of 6 young Mexican cadets who died in the battle of September 13, 1847 during the Mexican-American War);
Beginning of the Week of Remembrance of the Farropiglia Revolution in Brazil on September 13
The Fast of Gedalia in Israel on September 13 (Heb.: צוֹם גְּדַלְיָה - is a minor Jewish fast day from dawn until dusk to lament the assassination of the righteous governor of Judah. His murder ended Jewish autonomy following the destruction of the First Temple);
National Pet Memorial Day in US on September 13 (Second Sunday of September)