Aion team has announced two separate weekends events:
Double Experience:
December 3 (12:00 p.m. PST) – 6 (12:00 p.m. PST), 2010
December 10 (12:00 p.m. PST) – 13 (12:00 p.m. PST), 2010
99% Off Soul Healing:
December 4 (12:00 a.m. PST) – 5 (11:59 p.m. PST), 2010
December 11 (12:00 a.m. PST) – 12 (11:59 p.m. PST), 2010