A Juneteenth Celebration of Family History June 17, 3-5 pm Blockson Collection, Sullivan Hall, 1310 Polett Walk A Juneteenth Celebration of Family History with Charles L. Blockson and Dianna R. Cassey Mr. Blockson and Ms. Cassey explore the methods and materials essential to family research hosted by Dr. Diane D. Turner, Curator. The Charles L. Blockson Afro-American Collection is proud to celebrate Juneteenth, the oldest nationally celebrated commemoration of the ending of slavery in the United States. From its Galveston, Texas origin, the observance of this date as African American Emancipation Day has spread across the United States and beyond.