It isn't necessary for Irish sessions to start at 11pm. Whilst on honeymoon in Dublin, we went to the Brazen Head (best and possibly oldest pub in Dublin), for a Sunday lunchtime pint and got into a session. That was at about middday. It was still going 7 hours later, when they paused to move into another room, so they could start the folk club! The pub had closed and opened again twice without any noticeable pause in service except that at about 5.50pm there appeared a row of about 10 pints of guiness, 3 deep along the bar. At 6.01, the door flew open and about 30 men came in, slammed the money on the bar and downed the pint. Guess Mass had just finished.Don't know how long the folk club went on to, because we got dragged off to have our lunch!!
LTS