It's a long weekend across the island but with different closure patterns on either side of the border. Here are the main arrangements for the main repositories:
Northern Ireland
The Public Record Office of Northern Ireland and all libraries will be open on Friday 29 March and closed on Easter Monday and Tuesday, 1 and 2 April.
Republic of Ireland
The National Archives of Ireland and all public county and branch libraries will be closed from Good Friday 29 March until Monday 1 April inclusive, returning to normal hours on Tuesday 2 April. While the Reading Rooms at the National Library of Ireland will also be closed over the same period, the NLI's Exhibitions (Yeats, Seamus Heaney, and People & Places) have bespoke arrangements, which you can check here.