@mhartste another fix would be to replace the line 963 of /var/www/wp-content/plugins/events-manager/admin/dashboard.php
which throws the error with this line:
// $status_arg = implode(',', $args['status']);
$status_arg = is_array($args['status']) ? implode(',', $args['status']) : $args['status'];
The implode function is used to convert the array to a comma separated string. With this change it will do the same, but if status is already a string instead of a array, it just uses the string.