If you want to play with drones, from DAD you almost have to use a capo. Either standard capo at the first, or a reverse capo under the drone strings at the first fret. It can be done without a capo, but you have to fret a lot of chords. The DA drones will clash with all the Em phrases. An alternative would be to not strum the drone strings at all, and just play the melody. That's what a fiddler does, though most modern fiddlers embellish the daylights out of tunes. You don't need to do everything a fiddler does. The whole melody can be located between the the nut and the 3rd fret, if you start on the bass string. Perfect for walkabout dulcimers. Another alternative is to raise the bass string to E, and the middle to B. This eliminates the capo, and gives you the correct drones for this song. You will then be tuned to EBD, and play all the melody notes on the melody string. More than one way to skin a cat. But beware of the ladies- As I understand it,the annual Faire in Lisdoonvarna was a place ladies went to find a husband! You could come home married!
Paul