Flame and Frost: Prelude is the prologue to a multi-stage narrative that will bring big changes to Guild Wars 2 in the months to come.

event begins with Temple of the Silent Storm Week

The sky falls and the ground shakes in the lands of the north. Charr and norn refugees crawl from the wreckage of their homes in the Wayfarer Foothills and Diessa Plateau, struggling to find shelter in the south. The call goes out for volunteers to assist the victims in this time of need, when earth and sky seem to have become the enemy…
https://www.guildwars2.com/en-gb/the.../january-2013/