The Passion of Joan of Arc / Voices of Light. Chicago Symphony Orchestra; Marin Alsop, conductor; Vocality, Alumni Singers from Ravinia’s Steans Music Institute. | Ravinia Festival is the oldest outdoor music festival in the United States with a series of outdoor concerts and performances held every summer from June to September. A perfect evening - listening to music, drinks and a picnic under the stars on Ravinia's lawn. *Lawn ticket prices are increased by $5 on the day of the show.