First, a very warm welcome to Rootschat.
There are a number of adverts 1881 in the "People's Advocate and Monaghan, Fermanagh and Tyrone News" re. the clothing shop of "B. Garrity, Glasslough Street, Monaghan" - none provide a shop number. In 1886, same newspaper, "B Garrity, Glasslough Street" advertised the opening of a leather clog making business at the Glasslough Street premises.
In Nov 1896, same newspaper, a Patrick Hughes advertised he was taking over "the premises in Glasslough Street lately occupied by Mrs Bridget Garrity".
The same paper, 1 Feb 1902, has the death of a Mrs Bernard Garrity, formerly of Glasslough Street. She died in Glasgow and was brought back to Monaghan for burial. There's a lengthy report of the funeral.
Wondered if the above was part of your "Garrity family, North Gate"?