If there is a strong religious influence in the cultures then the name really should have some reference to the god(s)
"The Revenge/Cleansing of the Gods" "The day Mordain's Hammer struck the mountains." "The day the Heavens shook." "The day hell's souls burst through the earth. (aka "The day of the soul escape" or if the souls are messangers to heaven and/or earth then "the day of the message" ) " etc...
If the natural disasters happen in heavily populated areas, then there is probably lots of death so some morbid title might be more appropriate.
"The day of the purging" "The day of death" "The day of sorrow" "The day of the weeping"
I don't know, just some thoughts...
"The Revenge/Cleansing of the Gods" "The day Mordain's Hammer struck the mountains." "The day the Heavens shook." "The day hell's souls burst through the earth. (aka "The day of the soul escape" or if the souls are messangers to heaven and/or earth then "the day of the message" ) " etc...
If the natural disasters happen in heavily populated areas, then there is probably lots of death so some morbid title might be more appropriate.
"The day of the purging" "The day of death" "The day of sorrow" "The day of the weeping"
I don't know, just some thoughts...