Every Wednesday evening, the Charles River Esplanade fills with the swell of a full symphony orchestra performing for free beneath the open sky. The 2026 season marks the orchestra’s 25th anniversary, opening with a gospel-and-orchestral ‘Best of Boston’ and climbing through Mozart, the Verdi Requiem, and Saint-Saens’ thunderous Organ Symphony. Bring a blanket, watch the sun drop behind the sailboats, and let the music carry across the lawn.