Fixed it. Change ife-archive-content.php and change line 35 from
<div class=”<?php echo $css_class; ?> archive-event <?php post_class(); ?>”>
to
<div <?php post_class(array($css_class, ‘archive-event’)); ?>>
Got it! The event needs an end date because the plugin’s SQL query filters by this. The default end date (if it’s not set) is the event’s creation date (and this is in the past…).
To get the year manipulate ife-archive-content.php and ife-event-meta.php.
Simply add something like:
<span class=”year”> <?php echo date_i18n(‘Y’, $event_date) ; ?> </span>
It was no difficult problem, but I miss some documentation. I didn’t want to manipulate code files which can result in problems with a possible future update.