From November 22nd to November 30th some special events happen on Norrath.
* From Tuesday, November 23rd to Monday, November 29th, the Symbol of the Sated will be available on the Marketplace at no cost. This symbol causes those around you to yawn as if sated.
* From 12:00 noon (PST) on Tuesday, November 23rd to 12:00 noon (PST) on Monday, November 29th faction hits, both positive and negative, all across the world will be increased.
* From 12:00 noon (PST) on Tuesday, November 23rd to 12:00 noon (PST) on Monday, November 29th, several rare encounters will increase the rate of their appearance.
* The Haunting of Norrath events return on Monday, November 22nd and will remain until November 30th. UPDATE: Not all Halloween events will return, only the two new ones for 2010 that were bugged.
The entire SOE article is here.