Associated with milestones and history. Think of national independence or founding of institutions. The museum's bicentenary featured artifacts from its opening in 1823.
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Celebratory Events
Used for events that mark 200 years, often with ceremonies or festivities. A grand parade marked the bicentenary of the town.
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Notable Occasions
Implies a rare and significant celebration, occurring once in many generations. Her family's estate reached its bicentenary with a large gathering.