Juneteenth is an annual observance on June 19 to remember when Union soldiers enforced the Emancipation Proclamation and freed all remaining slaves in Texas on June 19, 1865. This day is an opportunity for people to celebrate freedom and equal rights in the United States.

https://www.timeanddate.com/holidays/us/juneteenth

or https://www.juneteenthlegacyproject.com/about?