Depends on what type of event you want to write about.
William Shakespeare - English poet, writer
Karl Marx - father of Communism
Wolfgang Amadeus Mozart - composer
Martin Luther King - activist/leader of Civil Rights Movement
Christopher Columbus - legendary Italian explorer
Ulysses S. Grant - part of the victory in the American Civil War w/ Lincoln
Overall, depends on what you want to write about. If you are allowed to write about anybody significant in our history, look through some of the options and just pick one that gets you interested. The more interested, the more you'll want to write.