The Clan holiday, Invasion Day refers to the Clan Invasion of the Inner Sphere, on November 21.
Started by the Crusaders, Invasion Day celebrates the “go vote” that started Operation Revival and is highlighted by fireworks and carousing. After the Crusader Clan’s loss to the Inner Sphere during the Great Refusal, the holiday has since been abandoned.
- The Clans: Warriors of Kerensky, pp. 7-8, 50