The Killers' frontman Brandon Flowers, Kelis and U.K. singer-songwriters KT Tunstall have been added to the line up for the second annual "Arthur's Day" Guinness brewery celebrations, set to take place Sept. 23 at various locations in Ireland.

Recent U.K. Chart-topper Tinie Tempah, fellow Brit urban star Plan B and singer-songwriters Eliza Doolittle and Newton Faulkner have also been added to the bill, which will see a number of simultaneous gigs take place throughout Ireland. Confirmed sites include Cork, Galway and Dublin, where the majority of live activity will be centered.

Paolo Nutini, Snow Patrol, José González, The Hoosiers, The View and Newton Faulkner were among the first wave of acts confirmed to perform at the 24 hour concert celebrations, which will also see a number of live "Arthur's Day" concerts take place throughout the U.S., Caribbean, Asia and Malaysia.

Details will be announced in coming weeks regarding international concert sites and artists performing, organizers tell Billboard.biz. International sites currently confirmed include Chicago in the States and the Malaysian capital Kuala Lumpur.

Arthur's Day was created in 2009 to mark the Guinness brewery business' 250th anniversary. Last year's anniversary celebrations saw over 60 artists, including Black Eyed Peas, Tom Jones, Jamie Cullum, Kasabian and Estelle, perform around the globe.

Tickets for the Irish leg of this year's event will be made available to purchase from www.ticketmaster.ie; ticket providers for other territories are yet to be announced.

In a statement, Brian Duffy, global brand director for Guinness, said: "Arthur's Day is once again going to be a global 'celebration with substance' that will see performances from some fantastic acts and musicians across the globe."

Proceeds from ticket sales for this year's event will be donated to the Arthur Guinness Fund, a charity organization supporting social entrepreneurship around the world.