I'm of two minds on this. As FFXIV has embraced the casual player as well as the hardcore, it's easy to say that these random events are good for the hardcore player with the time to either:

a. Research the random locations as they are discovered. or
b. hunt and camp at all hours until the event pops.

But for those who simply wish to play and receive this exclusive content, (Because let's face it, not everybody is supposed to get everything, that's what separates the hardcore from the rest. But to use the content as "the selling point", and not make it available for everyone is unfair. The equivalent of having an all you can eat buffet, but at the same time hiding the food.)

I would give several suggestions to remedy this situation.

1. Plot leve-quests: show how these events are changing everything. Connect it to the leve evaluation system so people are sent out to do different things at different places, but still get to see the whole story. For example, a person has been doing GC point leves. They get evaluated and they get a special grand company leve, but when they finish the leve instead of a crystal showing up they get a cutscene or an npc that directs them to a secret meeting or the cultist or what not. This is attainable by everyone without causing crowding.

2. Rift like invasions: Actually I imagine these would happen as the world gets closer to changing. Forces could attempt to assault the crystals and if they are not defended the moogles could steal them away for a short time (30mins to an hour tops, or at least until the invasion was repelled)

3. Simply putting out more content and throwing the "extra" content in, hidden in plain sight. I.E have the npc say the raid is in a certain area, but have several encounters set to trigger on the path so you could meet different people, etc.)

Just a thought.