Hi Phil,
It was decided to add additional escaping in our most recent release and that means the snippet provided last time round will no longer have the desired effect – sorry for the inconvenience on that count.
With that in mind, though, the best way forward would be to create a template override. Copy:
plugins/the-events-calendar/src/views/modules/meta/organizer.php
To your theme:
themes/YOUR_THEME/tribe-events/modules/meta/organizer.php
Then find this line:
<?php echo esc_html( $email ); ?>
Change it to:
<a href="mailto:<?php echo esc_attr( $email ) ?>"><?php echo esc_html( $email ); ?></a>
Be sure to remove the snippet provided previously – does that help?