Not unless you've completely deleted older versions of Perfect Pitch from your computer. I recognize your screen name, so I know that you've been around since at least the previous release and likely have a save file that the 0.4 version can call upon.
To account for new information getting revealed, new occurrences, new feelings, and that sort of thing; this game locks some events behind a set of pre-requisites. Said another way, information in event "A" and "B" is critical to understand event "C". So event "C" remains locked behind the A & B pre-requisites.
In a future update, the event list menu will have a little lock icon next to events which have yet to have their pre-requisite events completed. This way you aren't chasing your tail from class to class or date to date.
In the meantime, take a look at this event list to see what all has or has not been completed. If an event doesn't appear to trigger, you probably need to complete a different event first.
The Niedermeyer event has more pre-requisites than any other event at the moment because it's so big. To get this to proc you'll need to have completed Mountain Girl, Putting Down Roots, Delight & Despair, Tutto a Posto, Real or Imagined?, and Good Company. The Niedermeyer event also procs on Fridays only.
The lock icon in future updates should help address this sort of confusion.