Assuming this is referring to the Gettysburg Address, the occasion being celebrated was the dedication of the Gettysburg Cemetery.
When Abraham Lincoln gave the now immortal "Gettysburg Address," the country was engulfed in a Civil war over a set of issues, chief amongst them, slavery.
The Union had been taking heavy losses and so constructed the Gettysburg cemetery for some of their dead. Abraham Lincoln spoke at the event and:
- talked about how the Founding Fathers wanted liberty for all
- talked about the need to reunite the Union
In conclusion, Abraham Lincoln was invited to speak at the dedication of the cemetery and he gave one of the best speeches in history, the Gettysburg Address.
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