Castlebay will present a concert in celebration of the Celtic holiday Imbolc, also known as St. Brigid’s Day or Groundhog Day, Wednesday, Feb. 7, at the Rumford Public Library. The duo, Julia Lane and Fred Gosbee, will present songs and instrumentals played on Celtic harp, guitar, fiddle and woodwinds – interspersed with ancient lore and poetry. The program will begin at 6:30 p.m. in the library’s public room.