As I've mentioned before, I played a game (and I'm sure there are many more like that) that are build upon the exact same principles as this event, so I'm guessing Inno borrowed this idea for the event.
I can tell you ONE huge difference between the game I played and this event. It did NOT have a bottleneck like the ship and festival. All the goods (shamrocks in this case) that you produced, where added directly to your total available goods (shamrocks) instead of going through a middle step like this ship or festival. And this is why this event is so unbalanced. They introduced a middle step that just doesn't really work with the initial mechanics. IF we had more time (if it was a game and and not an event), MAYBE we could balace out the production from factories with the ship/festival, but here we cannot do that.
So yeah, I think this event is just a failed design. Maybe someone will figure it out (though it shouldn't even be that complicated in the first place), but right now looking at how much time is needed and the little reward you get for that, just don't feel like it's worth a sweat.
@wowo the woolve warrior 100% agree with your above post.