The Simpson family travels to Ireland to take Grandpa to have one last beer at his beloved O'Flanagan's Pub in Dunkilderry. However, when they arrive, the little town of Dunkilderry isn't the quaint little Irish village that Grandpa remembers. It has become a gentrified yuppie enclave filled with hipsters on laptops and Bluetooths, surrounded by swanky stores and coffee shops. When they track down O'Flanagan's Pub, the bar is run down and nearly empty. After a few spirits, Homer and Grandpa buy the pub from Tom O'Flanagan, and they are left with trying to bring the bar back to life amidst an ultra-hip, hardworking and sober Irish town. With a little help from Moe, they find the perfect scheme to bring the pub back to life and put "Simpson & Son" on the map.