I'll second Weerover on the timing. My favourite session in the area I visit regularly is Saturday night in Tig a Cuinne in Brandon Co Kerry. It's basically accordions, bodhrans and guitars with the odd pipe and whistle thrown in.

I've often arrived at 10.30 pm and the place is deserted - only warming up around midnight.

This pub, by the way, is where Christy Moore spent all day playing with the locals just before penning "Brendon's Voyage" - the saga of St. Brendan discovering America etc after sailing from Brandon in the year of 501.

Slainte