WGBH presents the 12th annual A St. Patrick’s Day Celtic Sojournwith Brian O’Donovan in two venues this year. As is our tradition, we will return to Harvard University’s exquisite Sanders Theatre in Cambridge for two shows on Saturday, March 16 before adding a matinee at the Cabot Theatre in Beverly on St. Patrick’s Day itself, March 17. This year’s cast showcases exquisite musicianship from groups and individuals representing the core tradition including the Friel Sisters, Yann Falquet and Pascal Gemme, Keith Murphy, and Katie McNally and Neil Pearlman. It’s a celebration of the true essence of St. Patrick’s Day.