Well,
There is an excellent session in Sullivans pub in Killea co. Tipperary on 11th April and a very good session in Crusheen in Co. Clare on Wednesday (I think it is the 3rd Wedneday in the month but I a not certain) Good session in Banagher on 3rd Moday of each month (Offaly)and also in Ballyboy on the last Monday of the month.

Could also recommend Jim o' the MIlls pub near Upperchurch on any Thursday. Tends to be a very late session. Hard to find though because there is no pub sign. But locals will direct you.