For V2.0:
Currently, without editing the core plugin, no.
You can add these into …../all-in-one-event-calendar/lib/twig/ai1ec-extension.php as twig functions (you will see many examples in that file on how they work) and then access these through twig in a child theme.
For twig documentation, look at: http://twig.sensiolabs.org/documentation
Well, I tried to work around learning twig by trying to use the loop in my template to iterate through the events.
This works, but I can’t seem to get the events into the right order, because ai1ec stores the dates and times in an extra table in the database.
Which should work with a post_orderby filter.
I tried this now in my loop:
$querystr = "
SELECT $wpdb->posts.*
FROM $wpdb->posts
WHERE $wpdb->posts.post_type = 'ai1ec_event'
AND ($wpdb->posts.post_status = 'publish' OR $wpdb->posts.post_status = 'draft' OR $wpdb->posts.post_status = 'revision')
INNER JOIN rwf_ai1ec_events ON (rwf_ai1ec_events.post_id = $wpdb->posts.ID)
ORDER BY rwf_ai1ec_events.end DESC
";
$pageposts = $wpdb->get_results($querystr, OBJECT);
This doesn’t work – as soon as I try to join, I get no results in $pageposts.
