Len Graham and Brian Ó hAirt, two award-winning proponents of Irish traditional arts, will give a performance of “In Two Minds: Songs, Music and Dance from the Irish Tradition,” on Friday, April 12, at 4:30 p.m. at the Lewis Center for the Arts’ James M. Stewart ’32 Theater at 185 Nassau Street. The performance is part of a series presented by Princeton University’s Fund for Irish Studies. The event is free and open to the public.