O'Reilly's
Open Mic Night

5pm - Chris Hennessey
10pm - Open Mic
12am - Rob Cook and Larry Foley

Shamrock City Pub
Open Mic

with Chris Ryan and Ronnie Power from Kilkenny Krew

By far the best I have ever attended is at "Auntie Crae's on Water Street. It is usually a Noon event going into the late afternoon . Unfortunately I do believe it is only on Tuesday or Wednesday. Some Newfoundland Catter could confirm this.
Here is a site that you could bookmark and check on it as time draws near. Wish I could go. Winter or not.
Beer (adrien)

http://whatsongeorge.com/venue_list.php