March of the Greenskins

This holiday, held on the 19th day of Brew-Month, is celebrated in the town of Heisenberg in Wissenland, commemorating the day on which a horde of Greenskins was repelled from the town. During the rise of the Orc Warlord Garruz Bloodskull, the town was overrun by waves of Orcs and Goblins. Bloodskull was surprisingly far-sighted for an Orc, and decided to keep the town intact, along with its inhabitants. The town was held for nearly two months until a contingent of Knights of the White Wolf swept through the town and routed the horde with the help of the townsfolk. Today, townsfolk make effigies of Orcs and Goblins and beat them with colourful sticks and pitchforks. Another group, dressed garishly in the “armour” of their saviours, come riding into town and order the townsfolk to haul the effigies to a pit outside the village and set it on fire.

Source
pg. 146
 * Warhammer Fantasy RPG 2nd ED -- Tome of Salvation