The Cork folk festival in Ireland is on every year and starts 01 Oct 2009 - 30 Oct 2009.

Sponsored by Beamish, brewers of the famous Irish stout, the festival presents the best local, national and international folk music, attracting artists from all over the world in celebration of Irish native music, singing, song making and storytelling traditions. Irish dancing is very popular, with Irish dancing and set dances indigenous to Cork taught in special workshops, as well as other styles, like clog dancing and the Cajun two-step. Players of traditional instruments - like the button accordion, fiddle, pipes, flute and whistle - demonstrate their skills, and keen musicians can participate in master-classes in these instruments. Cork itself has a wonderful range of shops, restaurants and pubs, all providing fresh local produce and there are many buildings of historical and architectural beauty to visit as well as enjoying all the festivities
Info on Cork folk festival
Offical site with details of last year's line-up