The years where the Order of the Silver Dragon were counted among the angry undead.
This is a general timeline of Things The Party Was There For.
This is when the party is first active in Barovia and is causing the issues they cause.
The events directly causing the destruction of Krezk, starting with the rising of Ilya Krezkov.
The day the Apparatus was used to split Strahd von Zarovich in half a second time, forming the Alchemist and the Creature.