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Ai1ec requires write privileges as the webserver user to the directory …../wp-content/plugins/all-in-one-event-calendar/cache/

If WP can’t write to a particular directory, it will prompt you for FTP access so it can try and use that to access the files. Unfortunately Ai1ec writes a lot of files in that directory, so you will get asked a lot of times, and even then it might not work as expected.

I would check the permissions of this directory if at all possible.

Note: If you go to Dashboard -> Events -> Settings then go to the Advnaced tab and then select “Cache Report” from the pulldown, it should tell you if it thinks the directory is writable by the webserver user.

This appears to be an issue with the way ics entries are being generated. I’ve logged a bug pointing time.ly people at some useful information that should help them figure out the cause of the issue.

Note: It doesn’t seem to be a simple 1-line fix, so it will probably require waiting till the next version is released.

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