Got your thinking cap on anon. I like it. However, with the exception of your point on [7] & [5], may I note that boiling down all your other categories leads to nothing more than "Trust Q" or "test".
Do you really think "test" or "omg trust q" is meaningful?
IMO you all should look into whether there is a mechanism of making sense of these often meaningless "crumbs". For instance, linking them to the real calendar somehow, or at least to each other, and then finally to the real calendar. If there is some kind of sophisticated coding going on here, there's no way it boils down to "trust" and "test". You feelin' me anon?