Guinness is Celebrating its 250th birthday and in the process they're having their inaugural Arthur's Day on the 24th September.
Tom Jones, Estelle and possibly the Black Eyed Peas are going to be playing at James Gate and loads of bands will be playing in local pubs around dublin.
From what I can figure you can only buy tickets per venue, without knowing who's actually going to be playing.
There is a pretty extensive line up of acts, with something for all tastes including David Holmes, Soul II Soul, The Kooks and Jamie Callum
Their website is unfortunately an epic fail and takes aeons to load, so I got bored and gave up looking.