Not explicitly. Vertically centering with HTML is a pain in the butt in general.
I would experiment with adding some empty vertical space to the header on the Seating Chart page. That would force the table display down the screen.
Add an empty image to the end of your header HTML, like this:
<img height=100 width=0>
This creates an image element with no actual image, which would appear as a broken image except we've set the width to be 0 pixels. Therefore, this will be an invisible image but it will take up vertical space