On August 27, 1883, the island volcano Krakatoa erupted; the resulting tidal waves in Indonesia's Sunda Strait claimed some 36,000 lives in Java and Sumatra.
On August 27, 1928, the Kellogg-Briand Pact was signed in Paris, outlawing war and providing for the peaceful settlement of disputes. Didn't work so well, did it?
On August 27, 1962, the United States launched the Mariner 2 space probe, which flew past Venus the following December.
On August 27, 1979, British war hero Lord Louis Mountbatten was killed off the coast of Ireland in a boat explosion; the Irish Republican Army claimed responsibility.
On August 27, 1928, the Kellogg-Briand Pact was signed in Paris, outlawing war and providing for the peaceful settlement of disputes. Didn't work so well, did it?

On August 27, 1962, the United States launched the Mariner 2 space probe, which flew past Venus the following December.
On August 27, 1979, British war hero Lord Louis Mountbatten was killed off the coast of Ireland in a boat explosion; the Irish Republican Army claimed responsibility.