Hi Sarah.. not too sure about places in Dublin but if you could make your way down to Naas in Co Kildare there is a little pub called “the Mill”. It actually is an old mill, selling wine & food. There are some great sessions out there with both sit back n listen and join in. Have been known to get drunk and sing a tune myself. If you feel like deviating from Dublin give me a shout and i’ll give you directions. The place is great, and mainly on a Thurs & Sun night for trad music. They would love you to join in.