Day 10, 12:00, for 18 hours: 24 zombies at ×2 health and ×2 attack.
Part of Endless tier 2, day 5 of 5.
When it ends: 
Scrap Metal
Broken Glass
Door Repair Kit
Five-Spice Beef Jerky (Endless rewards, tiers 1-4)
Day 10, 12:00, for 18 hours: 24 zombies at ×2 health and ×2 attack.
Part of Endless tier 2, day 5 of 5.
When it ends: Scrap MetalBroken GlassDoor Repair KitFive-Spice Beef Jerky (Endless rewards, tiers 1-4)