You may not be interested in all the fields in the event editing screen - for example you do not use the extra info or contact fields. In this case you will want to hide them during editing.
This can be done quite easily with some custom CSS.
If you add the following CSS to your sites template css file OR from JEvents 3.0.13 to: JEvents cPanel -> Custom CSS then the following fields will be hidden during event editing (in the frontend):
tr#jeveditlocation {display:none;}
tr.jev_contact {display:none;}
tr.jev_extrainfo {display:none;}
td.accesslevel {display:none;}
For more advanced editing screen changed see this article.