While not yet an official national holiday, we observe Juneteenth as a day of promised (and still yet to be fully delivered) freedom.
Slavery was abolished on January 1, 1863, but the news didn't reach every enslaved person until June 19, 1865.
That's why many have started to observe Juneteenth (June 19) as the actual start of freedom for everyone...
...While recognizing that many forms of freedom are still not yet felt for members of the Black community.