Indigo Girls / Ani DiFranco. Each pair of tickets purchased includes a CD or download of Indigo Girls’ new album, Look Long. | Ravinia, North America's oldest music festival, is nestled in a 36-acre, gently wooded park making it an enchanting place to experience music. Guests can bring their own picnics or eat at one of the park restaurants. *Lawn ticket price increases $5 on the day of the concert.