Remove Author and Date DIV from certain posts

I am using an event plugin that categorizes certain posts as events. For those types of posts, I wanted to remove the Author and Date DIV because it leaves a lot of unnecessary blank space.

Here’s an example of an event page:
http://blog.carnegiecenterlex.org/event/free-creative-writing-group/?instance_id=548

As you can see, there’s a lot of blank space on the left where the Author and Date would normally go. I want to remove that space.

The thing is, I know how to do this in PHP but don’t have FTP access to the server without contacting the server admin. I’d rather do it with CSS since I can use the WordPress CSS Editor and won’t have to contact my server admin. Is there a way I can do this with CSS, or do I have to use PHP?

Thanks!