Hey there James. Thanks for the note here, and for sharing the link right off the bat. A few ideas on this:
* Try switching to a different template under Events -> Settings -> Template. Chances are one of the other options there will fill the page better than the one you're currently on.
* If that doesn't do the trick, you'll probably want to do a template override of the individual event entry (single.php). We've documented the override procedure right here: http://tri.be/faq/what-are-template-overrides-and-how-do-i-do-them/.
Hope that helps. Let me know if it doesn't.