1876, Philadelphia, Pennsylvania. First official World's Fair in the United States, celebrating the 100th anniversary of the signing of the Declaration of Independence in Philadelphia. About 10 million visitors attended, equivalent to about 20% of the population of the United States at the time. The exhibition ran from May 10, 1876, to November 10, 1876. (It included a monorail.)

Centennial Exhibition

1939–1940, celebrated one hundred years since the signing of the Treaty of Waitangi in 1840 and the subsequent mass European settlement of New Zealand. 2,641,043 (2.6 million) visitors attended the exhibition, which ran from 8 November 1939 until 4 May 1940.

New Zealand Centennial Exhibition

better known as Expo 67, celebrating Canada's centennial year. This "Category One" World's Fair held in Montreal, Quebec, Canada, from April 27 to October 29, 1967. Sixty-two nations participated, and it set the single-day attendance record for a world's fair, with 569,500 visitors on its third day. Official attendance was 50,306,648. Was endpoint of the Centennial Voyageur Canoe Pageant, the longest canoe race in history. (Its monorail was a major attraction.)

1967 International and Universal Exposition

in memory of Mustafa Kemal Atatürk's (founding president of Turkey) 100th birthday.

Atatürk Centennial

100th anniversary of the 1st Summer Olympics in 1896.

1996 Summer Olympics

100th anniversary of the proclamation of Philippine Independence.

Philippine Centennial

100th Anniversary of the Xinhai Revolution and Republic of China

100th Anniversary of the Independence of Albania

started in 2014 with commemorations of the outbreak of the war and concluded in 2018 with Armistice centennial commemorations.

First World War centenary

100th Anniversary of the Independence of Finland

(CPC)

100th Anniversary of the Chinese Communist Party

100th Anniversary of the

Independence of Bulgaria

100th Anniversary of the foundation of the

Bulgarian Football Union

100th Anniversary of the foundation of the

Bulgarian Academy of Sciences

100th Anniversary of the foundation of

Sofia University

100th Anniversary of the foundation of

Bulgarian State Railways

100th Anniversary of the Republic of Turkey

100th Anniversary of the

Flying Scotsman

- Samastha-(Kerala,India)[1][2]

100th Anniversary of Samastha Kerala

Notable centennial events at a national or world-level include:

(1910)

Argentina Centennial

Generation Z

Sesquicentennial