How to remove white space on event post

Hi I am using the play book them together with ‘All in One event’ plugin.
I am getting a huge white space on the actual event post page (when you click through from the event calendar.
I have tried disabling all plugins and that doesn’t change it. I have also tried changing the theme and it doesn’t happen with other themes (i.e twenty thirteen).

I’m a novice so please explain in steps ??

Thanks so much in advance, I’d love to get this sorted! I did see a similar post but couldn’t find the same code in my css to change.