2:30-4pm Sun. Oct. 31 Bozeman Symphony: SYMPHONIE FANTASTIQUE Celebrate a haunting Halloween weekend with the Bozeman Symphony’s performances of Symphonie Fantastique, a rare sonic event that may not be witnessed in Bozeman again for decades to come. Willson Auditorium 404 W. Main St., Bozeman Cost: $27 and up Age: All Ages