What is that?
A card you give to someone on St Patrick's Day
And does such a thing even exist?!
The card or Saint Patrick?
This is a huge tradition in Ireland and the Irish community abroad. My wife, who has an Irish passport, gets Saint Patrick's cards every year from her Irish born mother and other Irish relatives.
No - that's a 'Saint Patrick's Day card'! After all, you send a Mother's Day card, not a 'Mother's card'.
Do you send Christmas cards or Christmas day cards? ;)
The season is 'Christmas', not 'Christmas Day'. There is no season of 'St Patrick'.
I don't know who came up with the phrase "cerdyn San Padrig", but when I first saw it I understood what it meant, so I'm happy with it