mage-eventpress/templates/single/organizer.php

<p>
    <?php echo mep_get_option('mep_by_text', 'label_setting_sec') ? mep_get_option('mep_by_text', 'label_setting_sec') : esc_html__('By:','mage-eventpress');  ?>
    <?php 
    $count_term = sizeof($org);
    $count = 1;
if( $count_term > 1){
foreach ($org as $_org) {
?>
    <a href="<?php  echo get_term_link( $_org->term_id, 'mep_org' );  ?>">
        <?php  echo esc_html($_org->name); if($count_term == $count){

}else{
    echo ', ';
} ?>
    </a><?php
$count++;
}
}else{
    ?>
    
    <a href="<?php  echo get_term_link( $author_terms[0]->term_id, 'mep_org' );  ?>">
        <?php  echo esc_html($author_terms[0]->name); ?>
    </a>
    <?php } ?>
</p>