I just happened across a YouTube video of Eamon Cotter playing The Stoney Steps and Corn Phiopa na Greine (The Sunshine).
They are such happy tunes they made me think of little girls with blonde ringlettes skipping through a flower garden chasing butterflies. I am quite certain Bambi and Thumper were off to the side frolicking under the willow.
Isn’t it amazing how evocative music can be? I have already printed the tunes off and have started looking for other happy little tunes to add to them.
I love happy tunes too!
The Barndance Bill Malley’s is a good one. 
I just listened to the Eamon Cotter tunes. Great stuff. Here it is:
https://www.youtube.com/watch?v=kPnabmFy_W8
Two of my favourite happy tunes are Memories of Ballymote and The Happy, as played by Conal O Grada on his album Cnoc Bui.
I play a lot on the street, so happy tunes are welcome.
Thanks for posting The Stony Steps. We play a lot of
Americana, as well as some Celtic tunes–some of the
former may as well be Irish (I mean, they seem to be
cut from the same musical cloth).
Some happy tunes, regardless of origin.
Soldiers’ Joy
St. Anne’s Reel
Whiskey Before Breakfast
The Girl I left behind me (Irish)
The Red-haired Boy
Balleydesmond Polka (I think the first).
Liberty
Fishing (I’m a goin fishin all of the time, Baby’s Going Fishin too)
Connaughtsman’s Rambles has been recommended to me as a happy tune, 'though musically I prefer the similar Swallowtail Jig.
I particularly like an energetic rendition of Mulhaire’s No. 9. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwih4pvUqKzTAhUJx2MKHc-vAggQtwIIIzAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D_0CTHmQ2Jus&usg=AFQjCNEQTV1i1LRhWaxkw3dEhwiL1D3XQA&sig2=Z1CLzXMTUT5IVrY6IHR1yw
Bob
Already, I have found several of the suggestions to be happy indeed. The Connaughtman’s Rambles is one of my favorites. I was unable to find The Happy on Youtube, but I will keep trying.
The other tunes have made it to the list. I love lively tunes in a major key. 
I know music affects others as it does me. In this group I am sure to be in good company.
Thank you for the suggestions.