Mike,
I was in the middle of the second day battle, just behind the wheat field (where the barns and farm house were) posing as a southern war correspondent and it was the largest battle reenactment I've ever seen, it was however not a good one to watch as a spectator as it covered so much area, much of which was not visible from the spectator area, the wheat field as well as the Devil's Den/Little Round Top were some of those areas.
They billed the event as by reenactors for reenactors..."spectators welcome"...so I'm assuming they weren't concerned with making it 'stadium' seating as much as presenting the broad expanse of a large battle. It was 4 hours of continuous fighting, in the 25 years of reenactments I've attended nothing even comes close, there are video and stills from the second day scenarios of things that I didn't even see as there was much fighting done in the wooded areas above the open fields.
http://www.youtube.com/watch?feature=pl ... 5KW5096D4chttp://www.youtube.com/watch?feature=pl ... Q57dOk14KA about 3/4 way through the second video you can see a white barn and wooded area in the right center, I was on the edge of the woods and for a time held the flag for Hurts' Alabama Battery, a single 3in rifle which was one of the horse drawn artillery units, (these guys had come from California, horses, gun and limber!) I think they were just moving in to place at the very end of this video.
There were also two scenarios on Friday that were not open to the public, one in the morning and one at 8PM
The spectators were charged 10.00 per day which is inexpensive compared to most reenactments so it was kind of a trade off, though the Sunday folks got more for the buck with the Pickett's charge scenario.