As Ravinia’s 2026 Grand Opening kicked off Saturday night, two big transformations came into focus. One was the public unveiling of the Hunter Pavilion after its major $70 million overhaul, which delivered sharper acoustics and a bespoke backdrop and successfully ushered in Chicago Symphony Orchestra’s 90th season of residency. The other was the personal revamp of special guest flutist Lizzo, who dressed up her Yittys and made her Ravinia debut …