MARLBORO—On Friday, June 10, at 7:30 p.m., in Persons Auditorium at the former Marlboro College, home of the Marlboro Music Festival, Juno Orchestra presents a triple-header concert that promises to be joyful.The show will feature Sibelius’ Impromptu for Strings after Op. 5, No. 5 & 6; Haydn’s Symphony No. 92, .