Yeah, this is an awkward system.
What you need to do is look for that event on the 20th, and when that event is on, go to the journey guide. At the same time the event is on, the journey guide missions will be available for you to play, if you meet all requirements. If you look at this on the day I'm writing you'll see the profundity as an example. It says "Event starts in 1d 4h" for me right now. The Executor and Leviathan just say "Event currently unavailable".
Once you have completed the unlock missions in the journey guide (and unlocked and upgraded the ship), the events table mission will then be available to you. You earn the blueprints to get up the rest of the star levels from there.
I don't really know why they continue to have those cap ship journey guides only open for one day a month, but that's how it is.
Thank you for the clarification!
Had another thing as my journey guide so I think that is why it didn't pop up, will be on the look out this month, it sucks that I already missed on 10 shards but it is what it is
