One important event of the abolitionists' movement was the Underground Railroad. The Underground Railroad was a system of safe houses and citizens who helped slaves escape to Canada.
Another important event in the abolitionists' movement to end slavery was the Emancipation Proclamation. The Emancipation Proclamation was the decree by President Lincoln that all slaves are freed. He issued the Proclamation after the North won the Civil War.
Maybe the most important event in the abolishment of slavery was the surrender of General Robert E. Lee at Appomattox Court House. This was the end of the Civil War and the North had successfully stopped the South from seceding from the Union. With the South's surrender in place the pain of slavery was over.
An important event in the abolishment of slavery as far as awareness goes was when William Lloyd Garrison began publishing the militant antislavery newspaper The Liberator. Garrison was a prominent abolitionist who with his newspaper started to spread the word of slavery and it's perils.
Nat Turner was an African-American slave who led a slave rebellion in Virginia on August 21, 1831 that resulted in 55 white deaths. He gathered supporters in Southampton County, Virginia. Turner was convicted, sentenced to death, and hanged. In response white slavers killed over 200 slaves.