Hello JudeyR, this is tricky as there are about 20 Mary Clark and variants born in Dublin from 1790 to 1810 and without the parents names we cannot isolate then, I did not seperate them to see if there were any in Balbriggan but according to a book written about 20 years ago Clark is a name found in Balbriggan. https://registers.nli.ie/parishes/0461 Balbriggan and Balrothery are side by side geographically and both names are in the parish name.
I found a Mary Ann Clarke born in 1798 in Balrothery to a Patrick Clarke and a Catherine Mullen
BAPTISM AGE:0 EVENT TYPE: Baptism BIRTH DATE:1798 BAPTISM DATE: 27/03/1798 BAPTISM PLACE: Balbriggan Dublin Ireland PARISH VARIANTS: Balrothery, Balrothery and Balscadden, Balscadden DIOCESE: Dublin
FATHER: Patrick Clarke MOTHER: Catherine Mullen HOUSEHOLD MEMBERS: Name Catherine Mullen
You should be able to see the entry in the parishes register link above.
No luck with Laurence Dunbar anywhere in Ireland, Dunbars not too plentiful but in Dublin and other counties, there is an interesting thing to the marriage in 1825 the male witness is a Dr, Reilly so assume a medical man and the lady witness is a Mrs Huston which is an unusual name.
Balrothery was a place where knights met from about the year 1200 and developed as a linen centre in the 1700s, however in 1780 a new mill was built in Balbriggan, then just a very small fishing port, the instigator of this was a Baron Hamilton. This led to an influx of workers probably from what is now Northern Ireland (this is what happened in Drogheda where I live anyway)
After this Balbriggan developed an international reputation for its woollens and the word is now in the English language in the US as so many went there taking their skills and I understand a unit of wool is known as a Balbriggan.
I only add this as background and the Dunbar family may have arrived following this influx or the marriage may have just taken place in her parish as per the norms.
From the fact of the witness being a doctor maybe seeing what records of the medical profession exist or how the Huston name fits in.