Shirts ordered after 6/15 are not guaranteed to arrive by 6/19. Depending on your location, expedited shipping maybe available but with recent disruptions due to citizens proudly exercising their first amendment right to assemble and speak on injustice, shipping maybe delayed.
Juneteenth is the oldest nationally celebrated commemoration of the ending of slavery in the United States. Dating back to 1865, it was on June 19th that the Union soldiers, led by Major General Gordon Granger, landed at Galveston, Texas with news that the war had ended and that the enslaved were now free. Note that this was two and a half years after President Lincoln’s Emancipation Proclamation - which had become official January 1, 1863 (Juneteenth.com)
For more information on the history of Juneteenth, please visit https://www.juneteenth.com/history.htm