Customize event creation/detail fields

I'm testing jevents. We need a central calendar to manage multiple rooms. This looks like it may fit. However, when a user creates an event, the layout doesn't appear logical and needs some customization. For example, I'd like the "contact" field to be labeled email address. I also need a phone number and separate name. Also, I'd like the "calendar" tab to be located inline with the other info.
Basically, how do I customize the event creation info.

Thank you