The official Webasite https://www.nps.gov/paal/index.htm
One thing that is amazing about the Rio Grande Valley is that if you drive 1 hour in either direction the landscape changes. We had this event bookedmarked on Facebook for a while and left early to go and see the “living history” presentation at the Battlfield.
The Volunteers showed how to load and shoot a musket and there was an artillery group showing the same for a cannon. You could download a self guided tour to your smartphone and as you walked through the different station it explained to you the details of the battle.