You may want to change the JEvents logo for the frontend editing screen. You can do this by adding the following to JEvents CPanel -> Custom CSS (The custom css feature was added from JEvents 3.0.13, all prior versions must add it to their template.css file) and adapting it according to your needs. Note that in this example the logo is loaded from the template's images folder and is called yourlogo.jpg - replace this with something meaningful to your site.
div#toolbar-box div.icon-48-jevents { background-image: url(../images/yourlogo.jpg); padding-left:100px!important; line-height:48px; }
For more more advanced event editing customisations see here.
To remove the logo completely and keep uniformatiy use:
div#toolbar-box div.icon-48-jevents { background-image: none !important; padding-left:10px!important; line-height:48px; }
This is valid for Joomla! 1.7 and upwards.