Check it out....

I ran it through several browsers for testing and didn't find any problems. (Firefox, IE6, IE7, Opera, Iceweasel, SeaMonkey, and Safari)

It could be resolution related. David, what resolution are you using for development? I know that sometimes (since I use a higher resolution) spacing can be an issue if I'm not careful, particularly if I use something like lightbox to display images.
It looks good. The only suggestions I have would be preferential. Mugen's idea of bolding the event dates would help on the calendar. I think you did a good job! I can see the info to the right of the sponsors and exiting a photo isn't a problem.