Day of Sanctuary

A festival unique to the Empire is the Day of Sanctuary (7th Sommerzeit). It remembers the founding of the Knights of the Blazing Sun, and is celebrated in every city where the goddess Myrmidia has a temple. A mounted procession of the Order of the Blazing Sun, resplendent in their battlegear, winds through the streets, ending at Myrmidia’s altar where her priests bless the knights’ weapons.

Source

 * Warhammer Fantasy RPG 3rd ED -- Signs of Faith pg. 31