This has not been announced yet.
I would assume Runescape Christmas 2010.
tip.it/runescape is a good website to use.
The runescape Christmas event will start between Dec-17 and Dec-19. There is a complete guide for the event with walkthrough and pictures in this website, http://runescape-quest.info/runescape-Christmas-event-2008-2009-guide-and-help-with-wiki/
For help, go here: http://gameolosophy.com/games/online/runescape/how-to-do-the-2009-runescape-christmas-event/
Every year since 2001 except for in 2003. There is an upcoming event for 2010.
The RuneScape Christmas event is a recurring optional player event within the browser-based MMORPG RuneScape. The event offers a variety of special quests, socialization options, and special rewards for participants.
apparently it will come at aound the 20th December or the 23rd at latest.
The Christmas event is sometime before Christmas and continues a few days afterward.
Have patience, it's not Christmas yet. And by the way, I don't know.
It is a little too late to ask that, as the 2010 Christmas event is over (obviously).
A Christmas Warble, some kind of parody of A Christmas Carol. For help, go here: http://gameolosophy.com/games/online/runescape/how-to-do-the-2009-runescape-christmas-event/
For help, go here: http://gameolosophy.com/games/online/runescape/how-to-do-the-2009-runescape-christmas-event/