22 Nights of Terror list so far:
#01. 12/13: 24 hour Cows TZ
#02. 12/14: 15 minute TZs
#03. 12/15: +50% gold find (additive)
#04. 12/16: 50% vendor discount
#05. 12/17: Double hitpoints
#06. 12/18: +50% physical damage
#07. 12/19: +70 replenish life
#08. 12/20: +100% Movement/Stamina
#09. 12/21: 100% Damage to Undead
#10. 12/22: Bonus Thorns damage
#11. 12/23: -Repeat- 50% vendor discount
#12. 12/24: +10% experience from Terror Zones
#13. 12/25: -Repeat- +100% Damage to Undead
#14. 12/26: +50% magic find (additive)
#15. 12/27: -Repeat- 24 hour Cows TZ
#16. 12/28: -Repeat- +70 replenish life
#17. 12/29: -Repeat- +50% physical damage
#18. 12/30: -Double Repeat- 50% vendor discount
#19. 12/31: +100% Damage to Demons.
#20. 01/01: -Repeat- 15 minute TZs
#21. 01/02: -Double Repeat- 24 hour Cows TZ
#22. 01/03: Resistances boosted by up to 75%
Event ends on 01/04 @ 11AM PST.