mage-eventpress/templates/template-prts/organizer.php

<?php 
add_action('mep_event_organizer','mep_ev_org');


function mep_ev_org(){
	global $author_terms;
 if($author_terms){ ?><p> <?php _e('By:','mepevent'); ?> <a href="<?php  echo get_term_link( $author_terms[0]->term_id, 'mep_org' );  ?>"><?php  echo $author_terms[0]->name; ?></a></p><?php } 
}