Juneteenth—also known as Emancipation Day, Freedom Day, Jubilee Day, and Liberation Day—occurs annually on June 19 and commemorates the emancipation of enslaved people in the United States.
The Historical Legacy of Juneteenth
(Smithsonian's National Museum of African American History & Culture)
"Juneteenth is an often overlooked event in our nation’s history. On June 19, 1865, Union troops freed enslaved African Americans in Galveston Bay and across Texas some two and a half years after President Abraham Lincoln signed the Emancipation Proclamation."