Here is the Marriage of Martin Creagh to Ann Fry.
It is not possible to say what the date it is recorded very badly. Feb is above and June is below.
So it's either march 1st, April 1st or May 1st 1855.
This is all I will get on your family. Its just a co-incidence that I am researching two other families from Rathdowney who were alive at the same time. Shiel and Creagh (not related).
I hope all of this was a help,
Peadar