A 200th anniversary or its celebration. Also called bicentenary.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "bicentennial" in a sentence
"Lydia Lunch got her musical start in bicentennial New York as one of the early performers in what may or may not have been punk rock."
"The 70's were such a distinctive and interesting decade, and the bicentennial was the height of it."
"Today we recall the bicentennial of a watershed in the history of the Church in the United States: its first great chapter of growth."