August the fifteenth is Mid-autumn day.

八月十五是中秋节。

youdao

From May fifteenth till August twenty-third, the Guggenheim in New York will present "Frank Lloyd Wright: From Within Outward."

VOA: special.2009.04.06

If there is a single day on which the Paris insurrection began in earnest it was August the fifteenth 1944, ten days before de Gaulle's triumphant appearance.

BBC: Part Two - France and Memory