CupOfTea's sounds like Fox Went Out on a Chilly Night, which I've heard and have a (Peter Spiers?) book for.

I'm learning "Coulter's Candy" right now - it's Scottish, but I learned it from the Irish Rovers and I wouldn't be surprised if it was sung in Ireland.

At this point I'll be changing library branches for the day due to a stargazing program I'd committed to that no one else wants to try. Since it'll be after DST and in South Florida, there's a good chance I won't be able to run it and can do something musical instead (perhaps throwing in a space filksong or two).

I'm aware of the difference between three-leaf shamrocks and four-leaf clovers, but it's a kiddy craft. If a kid wants to make a five-leaf clover, I won't stop them. And I'd rather try the Celtic knots anyway.

I know St. Brendan's Voyage and a couple other songs about him. Might be a possibility.