Elaine,
there a few portable planetarium providers in the country.
In the Dublin area try Big Bear Planetarium, Armagh Planetarium also travel. In the west try Exploration Dome and we (BCO) cover the south with our StarDome.
You can replicate it to a certain degree by using Stellarium with a projector onto the biggest wall you can find in a room that you can make fully dark.
BCO have also recently been making D.O.M.E.s with schools – out of cardboard. You can see the details and how-to here.