Originally Posted by
Enkidoh
1.0 gave a hint that in the 'calm' periods during Astral Eras it seemed to be very uncommon people for people to be awoken to the Echo, with a sudden 'rush' of new Echo users appearing being a strong indication a Calamity was approaching - Minfilia even stated this during 1.0's main scenario, that "after years of naught but rumours the past several moons have seen the hill of reports (of those awoken to the Echo) on my desk grow into a veritable mountain," so in between Calamities it was probably more "someone might inadvertently awaken to the Echo occassionally" without any influence from Hydaelyn.
Hydaelyn almost definetely knew when a Calamity was going to occur because of the aetherial flow suddenly occurring from a Shard back to the Source going from a trickle to a torrent as the Ascians schemed in the background to "upset the apple cart" so to speak and prime the two for a Rejoining, so the above "mass awakening to the Echo" was usually accurate that things were about to go very, very bad indeed.