Hi Scottkor,
There is no way to do this in the UI now. However, you can go in Code View and swap the order of the addHandler functions in registerEventHandlers
<script type="text/javascript" gwd-events="registration">
    // Support code for event handling in Google Web Designer
     // This script block is auto-generated. Please do not edit!
    gwd.actions.events.registerEventHandlers = function(event) {
    .....
   };
We have a feature request to allow reordering of the events in the Events panel but it has not yet been prioritized.
Thanks,
San
Google Web Designer team