Belfast
The Public Record Office of Northern Ireland: PRONI will be closed from Monday 26 December to Wednesday 28 December inclusive. Open Thursday 29 and Friday 30 December. Closed Monday 2 January 2017.
General Register Office of Northern Ireland: GRONI will be closed Friday 23 December to Wednesday 28 December inclusive. Open Thursday 29 and Friday 30 December. Closed Monday 2 January 2017. Reopening on Tuesday 3 January.
Presbyterian Historical Society Library: The Library and Archive will be closed from Wednesday 21 December 2016 until Tuesday 3 January 2017.
Dublin
National Library Reading Rooms: All NLI reading rooms will be closed from Saturday 24 December to Monday 2 January 2017 inclusive. Normal hours from Tuesday 3 January.
National Library Exhibitions: Exhibitions will be closed from Saturday 24 December to Tuesday 27 December inclusive; They will open from 10amd to 4:45pm from Wednesday 28 December to Friday 30 December inclusive. They will be closed from Saturday 31 December to Monday 2 January inclusive. Normal hours from Tuesday 3 January.
National Archives of Ireland: The Reading Room will close at 12:30pm on Friday 23 December and re-open at 9:15am on Wednesday 28 December. Normal hours Thursday and Friday 29 and 30 December. It will be closed Monday 2 January and will re-open at 9:15am on Tuesday 3 January.
RCB Library: The Representative Church Body Library and Archive will close at 4pm on Friday 23 December and re-open at 9:30am on Tuesday 3 January 2017.
Dublin City Public Libraries: All Dublin City Public Libraries will be closed from Saturday 24 December to Monday 2 January 2017 inclusive. They will all re-open to normal hours on Tuesday 3 January.
London
The National Archives, Kew: TNA will be closed from Saturday 24 December to Wednesday 28 December inclusive. It will be open Thursday 29 and Friday 30 December. It will be closed on Monday 2 January 2017.
Society of Genealogists: The SOG will close at 6pm on Thursday 22 December and re-open on Wednesday 28 December. It will be open on Thursday 29 December for one day only, closing at 6pm. It remain closed for annual stocktaking until Tuesday 10 January 2017.
Irish Genealogical Research Society Library: Based at the Society of Genealogists, and open on Saturday afternoons, the IGRS Library will not open on the following dates: 24 and 31 December and 7 January 2017. Back to normal routine on Saturday 14 January.