The Temple Bar TradFest is scheduled for 27-31 January, 2010. I went last year, loved it and am returning for this next one.
While they still have a lot of information to post for this next year, they have put up their scheduled evening concerts. Just go to the website, click on "What's On" on the left and then click on "Live Acts". Note when you get to the Live Acts, there is a difficult to see horizontal scroll bar that lets you view all six scheduled concerts. Tickets go on sale in December. (As far as a I can tell, this is the only information for the upcoming festival on the website as of this date. From an e-mail I received, I think they plan to have it all up by mid-November.)