There are two tarmac Championships running in Ireland. The Irish Tarmac Rally Championship...
http://www.irishtarmac.com/rallies.cfm
...which is 6 rounds (Galway, Circuit of Ireland, Rally of the Lakes, Donegal, Ulster and Cork), and the Dunlop National Rally Championship...
http://www.nationalirishrallychampionship.com/
...which is 8 rounds this year (Birr, Mayo, Circuit of Kerry, Carlow, Munster, Tipperary, Clare and Donegal).
As I understand it the Dunlop National Rally Championship has a reasonable entry list (which is closer to the Irish Tarmac Rally Championship than it used to be), but the Irish Tarmac Rally Championship is still the pick of the bunch.
2012 Irish Tarmac Rally Championship Dates:
Galway - 4th & 5th Feb.
Circuit of Ireland - 6th & 7th April.
Rally of the Lakes - 4th, 5th & 6th May.
Donegal - 15th, 16th & 17th June.
Ulster - 17th & 18th August.
Cork - 6th & 7th October.
Obviously we've missed the Circuit of Ireland this year, but Donegal is still a couple of months away!
http://www.donegalrally.ie/