Found the marriage on familysearch.org of MARGARET DIXON to PATRICK JOSEPH HARTE, as follows:
Ireland, Civil Registration Indexes, 1845-1958
name: Patrick Joseph Harte
registration district: Dublin North
event type: MARRIAGES
registration quarter and year: Jan - Mar 1914
volume number: 2
page number: 512
digital folder number: 4199364
Margaret Dixon's details are exactly the szme, so a match! You can purchase this record from the GENERAL REGISTER OFFICE, ireland (google for details) if you want. This will give fathers & sponsors names, + the Church they were married in + info about what they worked at.
I looked for Patrick Hart(e) on the 1911 census, but there are a number with that name. You'd really need the marriage cert to find his father's name, and therefore the family on both the 1901 & 1911 censuses.
I then checked the 1939/40 Electoral Rolls again, and found a Patrick & Margaret Harte living at 12 Georges Place North (which is on the North side of Dublin).
Hope this info helps!