There's a long weekend ahead for the Republic of Ireland, where Monday 31 October will be a bank holiday. Most libraries and archives will be closed on that day.
The major exception is the National Library of Ireland in Dublin. While its exhibitions will be open 12Noon to 5pm, the Reading Rooms in Kildare Street will be closed. It's free Genealogy Service won't be running, either.
Public lending and local studies libraries in Dublin and around the country will be closed on both the Saturday (29th) 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.