April 12th is Confederate Memorial Day and also the anniversary of the bombardment of Fort Sumter in Charleston Harbor which happened 149 years ago today.
The day is given to remember the sacrafice of the soldiers who died in the war. It's NOT about the causes, or the "justification" for the war. The individual solider was just doing his duty as he felt it.
The memorial at Rivers Edge State Historic Site is a tribute to the dead of the "lost cause"