[ZK] You need to get in touch with this fine body of people. Who will no doubt explain that it was, of course, the Welsh who discovered America in the first place, a fact disputed by Native Americans who unaccountably reckon that they got there first!
[BM] I think you need to write to these people and explain to them the error of their ways. I've lived in Ireland and the U.S., and while I agree that abominations like green beer are a U.S. invention, it's simply not true that Patrick's Day is not celebrated in Ireland.
(Dr Q) Isn't it true that there are probably a greater proportion of Welsh descent in Pennsylvania than in any other American state, though that proportion wouldn't be very large. Well, obviously, from what you say. It seems to me these Saint's days are used as yet another means of relieving people of their money, like Mother's Day (formerly Mothering Sunday) and Father's Day. I've got no kids, but I have two nieces, so what about Uncle's Day, or Eldest Son's Day. Come on! Oh, it's all bollocks, isn't it? :-)