Beannachtai Na Feile Padraig Oraibh!
Time for the wearin' of the green! Get out your harp and shillelagh. Bake some soda bread and cook up some colcannon. ANd, of course, read some Irish stories!
 For something about St Patrick, how about The Last Snake in Ireland by Sheila MacGill-Callahan.
For your listening pleasure how about some Celtic music. (that's pronounced Keltic, if you pronounce it with an S sound, you are talking about a basketball team.) Try Celtic Songs for Children  by Golden Bough or Celtic Tides  from Putumayo World Music.
If you'd like a nice book with lots of choices try A Pot O'Gold: a treasury of Irish stories, poetry, folklore, and (of course) blarney selected and adapted by Kathleen Krull with lots of illustrations by David McPhail (one of my favorite illustrators).
Brave Margaret  by Robert San Souci is a good fairy tale for big kids--a girl battles a sea serpent and rescues her true love from a giant troll.