Rossen Milanov, principal conductor of Orquesta Sinfonica del Principado de Asturias in Spain, dedicates an evening to a world of music for "Festival Orchestra 3." That would be Mahler's Symphony No. 7 in E Minor, whose massive forces call for an expanded wind section, tenor horn and mandolin.

An outdoor gathering that includes pre-concert amusements like performances by youngsters from Virtuosi of Houston, nibbles from local food trucks and lectures that serve as a listening guide to the programmed repertoire kicks off the concert at 6:30 p.m. Music starts at 7:30 p.m.