First thing you need to fix is to call the language Irish, not Gaelic. *
On European keyboards Ctrl + Alt + aeoui adds the accent/fada.
There aren't many traditions on St. Patricks Day in Ireland - certainly not gifts. While it is a national holiday it's actually a low key affair outside of Dublin - many places in the US actually have much bigger celebrations than you would have in Ireland. I know a few friends who visited Ireland on the day itself and were a little disappointed.
* Acceptable however if you're referring to the general culture of the Irish, Scottish, and Manx people.