Probably irrelevant now, but these three Civil Registration entries may be related to this search.
Patrick C. Canning and Bridget M Hickey both show with these marriage details 1st Quarter 1920 Dublin North Vol 2 Page 519
There is a birth for Patrick Christopher Canning 1st Quarter 1897 Dublin South Vol 2 Page 655
There is a birth for Bridget Mary Hickey 2nd Quarter 1898 Dublin North Vol 2 Page 493