This is not much help but it's a pity you are not going until late October as Kinsale in County Cork has a Jazz and Blues Festival
Kinsale Jazz and Blues Festival Played there many times a decade or so ago.

Go there anyway if you can as it is a beautiful place. I can recommend the fish and chips in almost any restaurant, of which there are many.Oh yeh and great beers
It's a quaint little town and is on the southeast-ish coast of Ireland.

My advice would be, if you had more time to hire a car, get a map, not Sat Nav, and drive round as I did 30+ years ago and so found this country pub/hotel/bar in South Western Ireland. The doors were open so me and the wife strolled in and ordered drinks. The Landlord said he couldn't serve for 30 minutes but we could take a seat and wait, which we did. As we got the maps out he came over and asked us if we wanted a drink while we waited. He found us somwewhere to stay that night as we all got too drunk to even breathe! and I went everywhere in those days with my 12 string! What a night!
I live in south Wales.

Enjoy your trip.

Alyn