Lots (79) of mentions in the Belfast Newsletter, starting from 1862.
The BMM seems to have been a non-denominational evangeligal movement, supported by the great and good of the town.
It aimed at offering safe refuge to "unfortunate women" and their offspring.
Ref: PROPOSED HOUSE OF REFUGE IN CONNECTION WITH THE MIDNIGHT MISSION .
The Belfast News-Letter (Belfast, Ireland), Wednesday, February 28, 1866; Issue 33308
[Committee members from Magdalene Asylum, Ulster Female Penitentiary, Rosevale Home & Belfast Female Mission invited attended, as did the Mayor, etc.]
Ref: MIDNIGHT MEETING FOR FALLEN WOMEN .
The Belfast News-Letter (Belfast, Ireland), Tuesday, April 23, 1872; Issue 55311.
[Men of the committee went out "2 and 2" to invite 100 girls back to the mission hall.
The mission would send ladies off to Dublin, Londonderry and Newry, as well as to Scotland and England.]
The BMM extended the scope of their saving remit later, attempting to organise "lights every 100 miles across the Atlantic" !
The last article (in the British Library's online archive of 19thC rural newspapers) reports that 553 women had been admitted in the elapsed year from Feb 1899 - Feb 1900.
27 treated in hospital.
Ref: BELFAST MIDNIGHT MISSION .
The Belfast News-Letter (Belfast, Ireland), Wednesday, March 28, 1900; Issue 26411
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The 'Directory of Sources for Women's History in Ireland' at
www.nationalarchives.ie is always a good place to search for information relating to the North of Ireland.
[Though not so important now that PRONI has its eCatalogue.]
However, in this case it only points to one of the PRONI holdings.
D/2072
Minute book of the Belfast Midnight Mission for unmarried mothers, Belfast, 1934-1949 and associated papers, 1947, 1966.
Revving Jock