Discarded Doctrine event not available?

"Beef;c-2372736" wrote:
I had it unlocked already before the date. And it didn't show up for me on the 15 th. I saw the count down for the days till event , then next day nothing.

By unlocked they mean get the ship unlocked, not have the prerequisites done. You have to do the first tiers through the Journey Guide before it shows up in events.