This is a grandstand that has a number of array modifiers so it can be scaled both in width and height very easily with only a handful of additional adjustments to the sides and back.
It also has a choice between bucket seats on layer one or bleacher seats on layer 2.
Sorry I didn't reply sooner to your comment but I only became aware of it after the moderators Emailed me. I hope you were able to get it working OK. If not then one solution I use when a .blend file isn't working properly is to test it using one of the latest blender builds from graphicall.org. Hope that helps.
Strangely when I render the project, nothing appears. The objects are all in wireframe mode, but it does not turn to solid mode. Why is that?