Sestercentennial
In 2009.
Semiquincentennial
September 7
What Not to Wear - 2003 250th Anniversary Episode was released on: USA: 29 January 2010
centenary
November 2009
Pearl.
No
2026
2/250 = 0.8%
One common definition is quarter-millennialThe MOST correct answer is Sestercentennial literally meaning half way between 200 and 300 years.
a four leaf clover