Regarding the titles, I've come across a few threads from people asking why they didn't get the title for Set (X), but were still able to access and complete the event, like for GL Ahsoka.
As for the Executor, I may be wrong, I just looked at the second part of that sentence like this: he tried to access the event right now, as in not on the 15th, and is unable to unlock the ship so he can access the Bonus tier later on. The preposition for was a major reason behind this assumption. There was at least one other thread like this, a person asking why they can't access the ship event even though they have all the requirements done, and it turns out they weren't aware of the whole specific date thing.