There's a long weekend coming up in the Republic of Ireland. If you were planning on using the time to carry out some research, be aware that most relevant institutions will be operating on public holiday schedules, as below.
The National Archives of Ireland (and its free Genealogy Service) will be closed on Monday 5 June, reopening at 9:15am on Tuesday 6 June.
The National Library of Ireland's Reading Room will operate to normal weekend hours (Saturday 9:30am to 12.45pm; Sunday closed). Neither the Reading Room nor the free Genealogy Service will be available on Monday 5 June.
Exhibitions at the National Library of Ireland will be open on Saturday and Sunday as usual (Kildare Street: Saturday 9.30am–4.45pm; Sunday: 1:00pm–4:45pm. National Photographic Archive Gallery in Temple Bar: Saturday 10am–5pm; Sunday: 12pm–5pm). Bank holiday Monday opening will be from 12pm to 5pm only at both locations.
Dublin City Library & Archive will be closed on Saturday 3 June and Monday 5 June, as will all branch libraries in the Republic.
The General Register Office Research Room at Werburgh Street, Dublin, will not open on Monday 5 June. It will reopen at 9:30am on Tuesday 6 June.
The Research Room of the Representative Church Body Library will be closed on Monday 5 June, reopening at 9:30am on Tuesday 6 June.
NOTE: This bank holiday applies only in the Republic; Northern Ireland institutions (as all in the UK) will be working to normal hours, having had their early summer holiday the previous week.