In honor of Constitution Day, the Charles Pinckney National Historic Site will premiere the ETV documentary Forgotten Founder: The Story of Charles Pinckney. The free outdoor screening takes place on Fri. Sept. 17, and the film will broadcast on ETV on Sept. 23 at 9 p.m.

Pinckney was one of the framers of the U.S. Constitution, served as both a congressman and a senator, and was Thomas Jefferson’s ambassador to Spain. Historian Walter Edgar will introduce the doc. Afterward, Forgotten Founder’s producer and director Sanford Adams will answer questions.

For more information, visit the park’s website.