Add attachments to Calendar Is it possible to add attachments (like photos) to Calendar events?

For example, I gathered the flyer of an event I want to attend. It is far in September, and having added the event to remember about it, I'd like to attach the picture I've taken of said flyer.

I don't know if the problem is the Italian version of Calendar, but I can't find the "Add Attachment" link - it is missing while editing.
Check this. It appears that attachments can be added to local calendars only. It may also be possible with calendars synced with remote servers, if the server supports it (but that's just a speculation, I don't know if such servers exist)