Danny,
Date of the marriage was 17th May. Witnesses were Thomas Laverty and Patrick Rice who was presumably a relation:
http://registers.nli.ie/registers/vtls000632567#page/103/mode/1up
Dromintee’s baptisms don’t start till 1853 so if that is where Thomas was baptised, sadly the records don’t exist. Forkhill is partially in Mullaghbawn RC parish. Their baptisms start in 1845. Have you searched them for Thomas’s baptism? The RC parish records are on-line free on the National Library site:
http://registers.nli.ie/parishes