Just two days after President Joe Biden officially made Juneteenth (June 19) a new national holiday, celebrities and politicians are taking a moment to honor the important date.

The holiday observes the end of slavery in the U.S. and marks the day, June 19, 1865, when Union Major General Gordon Granger announced the news to Black Americans in Galveston, Texas—which was two years after President Abraham Lincoln's 1863 Emancipation Proclamation.