There are 2 types of Referenda:
When the government wishes to change something in the constitution it must hold a constitutional referendum.
When the government wishes to introduce a law of national importance the Seanad and Dail can petition the President to hold a referendum.
Who can vote In a Referendum?
Every Irish citizen who is 18 years and included in theregister of electors is entitled to vote in a referendum.
To check the register of electors click on the following link www.checktheregister.ie
If you cannot find your name on the register contact the Franchise Section of your Local Authority.