Union of the Romanian Principalities commemorates the 1859 unification of Wallachia and Moldavia under Prince Alexandru Ioan Cuza. Known as the Little Union, it marked the birth of modern Romania and the beginning of national unity.

Australia Day is the official national day of Australia. It marks the anniversary of the arrival of the First Fleet at Port Jackson, New South Wales, in 1788, which led to the establishment of the first European colony in Australia.
is the official national day of Australia. It marks the anniversary of the arrival of the First Fleet at Port Jackson, New South Wales, in 1788, which led to the establishment of the first European colony in Australia.

Auckland Anniversary Day commemorates the arrival of Governor Hobson in 1840 and the founding of the Auckland Province, celebrated with public holidays, sailing regattas, and community festivities.

Northland Anniversary Day commemorates Governor Hobson’s arrival in 1840 at the Bay of Islands. It reflects the region’s key role in New Zealand’s foundation and serves today as a regional summer holiday for leisure and community pride.

Federal Territory Day is an official public holiday in Malaysia. It commemorates the establishment of the Federal Territories of Kuala Lumpur, Labuan, and Putrajaya. The day holds significant cultural and historical importance in Malaysia.

Nelson Anniversary Day commemorates the arrival of the first New Zealand Company settlers on February 1, 1842, aboard the Fifeshire. Today, it is used mainly for leisure and summer celebrations.

Constitution Day in Mexico is to commemorate the promulgation of the Mexican Constitution of 1917. This landmark document, created during the Mexican Revolution, established social, labor and land reforms, shaping modern Mexico's democratic and legal foundation. The holiday honors the nation's commitment to justice, equality and sovereignty.

Sri Lanka's Independence Day commemorates the island’s peaceful independence from Britain in 1948. Marked by flag-raising, parades, religious observances, and cultural events, it is a celebration of sovereignty and national pride.

Waitangi Day commemorates the signing of the Treaty of Waitangi in 1840, marking the foundation of New Zealand. It is observed with ceremonies, cultural events, and reflection on the nation’s bicultural identity and history.

Foundation Day in Japan commemorates the legendary founding of Japan by Emperor Jimmu, the nation’s first emperor, in 660 BCE. The day reflects national pride, unity, and the long history of the Japanese nation. While modern celebrations are generally quiet, people honor the occasion with flag displays, ceremonies, and reflections on Japan’s cultural heritage and national identity.

Statehood Day is Serbia's most important national holiday, commemorating both the First Serbian Uprising of 1804 and the adoption of the Sretenje Constitution of 1835, symbolizing the country’s path toward independence and democracy.

Heritage Day is a provincial holiday in Nova Scotia, Canada. It was introduced in 2015 to provide a mid-winter break while honoring the province's diverse and rich cultural heritage.