Lorraine: There's a new multimedia centre called Ceol in Captain O'Neills Hotel in Smithfield, in Dublin. I haven't seen it yet - but hear great reports from people whose judgement I would trust. There's a very good acoustic folk club there on Saturday nights, also. Recommended.
Apart from that, try the following pubs - all of which are in the same general area of inner Dublin:
Hughes' of Chancery Street
The Cobblestone of Smithfield
Noone's of Manor Street (?)
Regards
p.s. To find the old thread on Dublin pubs, try "forum search" in the thread list page - then put "Dublin pubs" in the "subject" box.