Caeltish, the Irish music trio led by fiddler Alyssa Barker, returns to Mrs. Murphy’s Pub. Other members are Ed Cardenas on drums and Christopher Bramel on guitar.  Mrs. Murphy’s also will present music by Ethan Robbins at 8 p.m. on Thursday, All She Wrote at 8 p.m. on Friday, Aiden Schnell at 8 p.m. on Saturday, and Robbins (noon) and Katie O’Brien (4 p.m.) on Sunday.