Google have added an Advanced Segment item for Event Tracking, so you can compare the behaviour of visits with an event to any other segment you choose. You can read about it and see a video here.
This reminds me to remind you – if you have any events on your website, whether it’s a document for download, a video to watch or anything else, make sure you add the event tracking code to it so you can see what’s happening in Analytics. Have a read of the two links in the blog post I’ve linked to above: Implementing Event Tracking and Event Tracking Best Practices, which will tell you how to do it.