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. This weekend’s music at Mrs. Murphy’s will feature Fiddle Pete at 8 p.m. Friday and 5 p.m. on Sunday, the Chris Hersch Old Time Duo at 8 p.m. on Saturday, and Sammy Wetstein at noon on Sunday.