Altan, Berkeley & Santa Cruz • March 26, 27 Altan showcases traditional Irish language songs from County Donegal, and features co-founder, lead vocalist and renown fiddle player Mairéad Ní Mhaonaigh, bouzouki player Ciarán Curran, guitarist Daíthí Sproule, and accordionist Martin Tourish. After 30 years of playing on stages all over…