<?php if( function_exists('tribe_the_custom_fields') && tribe_get_custom_fields( get_the_ID() ) ): ?>
          <?php
            //Check to see if there is any value in the field before displaying
            if(tribe_get_custom_field('Add a ticket link') != "") { ?>
                <dd class="event-meta event-meta-custom"><a href="<?php echo tribe_get_custom_field('Add a ticket link'); ?>">Ticket</a></dd>
            <?php } ?>
            <?php if(tribe_get_custom_field('Add a Youtube video link') != "") { ?>
                <dd class="event-meta event-meta-custom"><a href="<?php echo tribe_get_custom_field('Add a Youtube video link'); ?>">Youtube</a></dd>
            <?php } ?>
            <?php if(tribe_get_custom_field('Add a Soundcloud link') != "") { ?>
                <dd class="event-meta event-meta-custom"><a href="<?php echo tribe_get_custom_field('Add a Soundcloud link'); ?>">Soundcloud</a></dd>
            <?php } ?>
            <?php if(tribe_get_custom_field('Add any other promo link') != "") { ?>
                <dd class="event-meta event-meta-custom"><a href="<?php echo tribe_get_custom_field('Add any other promo link'); ?>">Promo link</a></dd>
            <?php } ?>
<?php endif; ?>