C-SPAN3 - available on Comcast channel 105 - is using its American History TV time slot to broadcast live and taped coverage of the Battle of Gettysburg sesquicentennial events Sunday.
The channel is inviting viewers on social media to participate.
Interact on Facebook at www.facebook.com/cspanhistory or, on Twitter, tweet to @cspanhistory and use the hashtag #gettysburg150.
C-SPAN3 will also commit 24 hours of air time July 4 to re-air Sunday's broadcast twice, beginning at 8 a.m.
That program will be filmed from a studio on the Gettysburg battlefield and broadcast live Sunday.
Here's the schedule:
9:30 a.m. - Kent Masterson Brown, Civil War historian and author, "Retreat From Gettysburg: Lee, Logistics, and the Pennsylvania Campaign"
10:30 a.m. - Brooks Simpson, Arizona State University history professor and author, "Victors in Blue: How Union Generals Fought the Confederates, Battled Each Other, and Won the Civil War"
11:30 a.m. - Ethan Rafuse, U.S. Army Command General Staff College history professor and author, "Robert E. Lee and the Fall of the Confederacy, 1863-1865"
12:30 p.m. - Harold Holzer, Abraham Lincoln Bicentennial Foundation chairman and author, "Lincoln: How Abraham Lincoln Ended Slavery in America"
1:30 p.m. - Howard Coffin, Civil War historian and author, "Nine Months to Gettysburg"
3:30 p.m. - Joseph Glatthaar, University of North Carolina history professor and author, "General Lee's Army: From Victory to Collapse"
4:30 p.m. - Tom Desjardin, Maine State chief historian and author, "Stand Firm Ye Boys from Maine: The 20th Maine and the Gettysburg Campaign"
5:30 - 8 p.m. - Viewer calls and tweets: Guests include author Jeff Shaara, "Gods & Generals" and "A Chain of Thunder," about the Siege of Vicksburg
8 - 9:15p.m. - "New Birth of Freedom" Commemorative Ceremony, with a keynote address by historian Doris Kearns Goodwin, author of "Team of Rivals: The Political Genius of Abraham Lincoln." The program will include "Voices of History," dramatic readings of eyewitness accounts written by soldiers and citizens swept into the events of the battle and its aftermath.
The ceremony ends with a candlelight procession to the Soldiers' National Cemetery to see luminaries marking each of the more than 3,500 graves of Union soldiers killed in the Battle of Gettysburg.
9:15 - 10 p.m. - Viewer calls and tweets: Peter Carmichael, Gettysburg College Civil War Institute Director.
- Erin James may also be reached at firstname.lastname@example.org.