The Constitution (Bunreacht na hÉireann) guarantees your right in Ireland to assemble or meet peacefully and without weapons. This right is limited by legislation to protect public order and morality. The law prevents or controls meetings that are calculated or designed to cause a riot or breach of the peace.
There are other limitations on your freedom of assembly. You cannot meet on private property without the consent of the owner - that is trespass. Parades and processions are not illegal but it is a public nuisance to obstruct a highway. You may not hold a procession or meeting within one-half mile of the Oireachtas (Irish houses of parliament) when it has been prohibited by the Gardai or you have been asked to disperse.
Your right to Freedom of Assembly is guaranteed under Article 40 of the
Constitution. You can view the
full text of the Irish Constitution here.