"After lunch, a shuttle bus will begin transporting the crowd to the opposite side of the battlefield. The first event of the afternoon will take place at 1:30 at a site described by General Alvin P. Hovey as A Cemetery on a Mound. According to Hovey, the area surrounding the mound was the location of the Union batteries and reinforcements as they fired into the Hill of Death from the west. Dr. Sidney Bondurant, author and historian, will read a newspaper clipping entitled, A War Reminiscence: General Alvin P. Hovey Relates an Experience with Grant at Vicksburg, from the March 8, 1885, publication of the Indianapolis Journal. The 126-year-old article, in Hovey’s own words, gives an entirely new prospective to the Champion Hill battlefield.

James Drake, local engineer and historian, will be in attendance at the cemetery site with several large maps which display Hovey’s Battery position during the war. Drake will also present research showing that the old road leading to Matilda’s house adjacent to the railroad, was once the original roadbed leading to Midway Station."

This goes a bit beyond how you have framed the re-enactment. The guns and the presentation are purported to be on the original site of Hovey's batteries. With full-blown presentations planned at the site, I can only imagine that the planners have instructive intentions.

The location, as described above ("fired into [Champion Hill] from the west"), sounds accurate, but like I said I didn't see an area cleared in preparation for the crowd so my curiosity is piqued.