Yea - I've searched a bit too, but the only way I have found for now is to create a note in Evernote and then copy the link into the notes section of the google calendar appointment I want to link it to. Maybe Google should buy Evernote then maybe they could get this to work.
What I am looking for is a way to create and/or access an existing Evernote note and attach or link the note as I create an appointment or event in Google Calendar. Would prefer not to have to start the process with Evernote, but rather Google calendar and be able to directly open/edit my note in Evernote from Google calendar. I don't see anyway to do this using Cronofy at this point.