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Sesquiennial
Leap year
An 150 year celebration is called a Sesquicentennial celebration
Items of Tin or Aluminum.
A 100 year celebration is called a centennial celebration.
60 year celebration
It is called a "centennial celebration"
China (not the country) is the traditional 20 year anniversary or celebration symbol.
Hogmanay is the name the Scots give to the celebration of New Year's eve and New Years day.
December got its name because it was the tenth month in the old Roman calendar which started the year in the Spring.
The "name" of the elven celebration in Eldest?The English name for it would be the Blood-Oath Celebration. The Elven name for it would be Agaetí Blödhren.