Juneteenth
 

https://nmaahc.si.edu/blog-post/hist...acy-juneteenth

But not everyone in Confederate territory would immediately be free. Even though the Emancipation Proclamation was made effective in 1863, it could not be implemented in places still under Confederate control. As a result, in the westernmost Confederate state of Texas, enslaved people would not be free until much later. Freedom finally came on June 19, 1865, when some 2,000 Union troops arrived in Galveston Bay, Texas. The army announced that the more than 250,000 enslaved black people in the state, were free by executive decree. This day came to be known as "Juneteenth," by the newly freed people in Texas.

Yeah, Lincoln freed the slaves in confederate states January 1st, 1863, but not the slaves in Union states. They weren't freed until the state freed them or the 13th amendment was ratified in December of 1865, six months after Juneteenth.