The Republic of Ireland enjoys its Autumn Bank Holiday next Monday (26 October) so you'll find most libraries and archives closed on that day.
The major exception is the National Library of Ireland in Kildare Street, Dublin, but while its exhibitions are open, its Reading Rooms and Genealogy Service won't be running.
Public lending and local studies libraries in Dublin and around the country will be closed on both the Saturday (24th) and the Bank Holiday Monday, returning to regular hours from Tuesday.
This bank holiday does not apply in Northern Ireland where repositories, libraries and commercial enterprises are open for business as normal.