Add Term Description to event category archive

term-description.php

<?php
/**
 * Copy the "src/views/list/content.php" file from the Core TEC plugin
 * 
 * Paste it into your theme at "tribe-events/list/content.php"
 * 
 * Place the following snippet in the new file within your theme wherever you 
 * would like the it to display.
 */

if( is_tax() ) {
  echo term_description( get_queried_object_id(), 'tribe_events_cat' );
}