EDINBURG - The Museum of South Texas History will host the Sunday Speaker Series Online presentation, “From Slavery to South Texas: Callis Family History,” featuring Nicholas Maddox, Sabrina Walker-Hernandez, Kimbley Callis and Floyd Hannah at 2 p.m. on June 20 on Facebook Live. The presentation will reflect on the history and significance of Juneteenth in the Rio Grande Valley. Maddox will share notes on his work with the Community Historical Archaeology Project with Schools (CHAPS) program’s documentary titled “Just A Ferry Ride to Freedom,” and the story of the Underground Railroad in the RGV. Walker-Hernandez and Callis will share the origin ...