VIENNA No dress code, no stiff atmosphere and no entry fees: Thousands flocked to a Viennese park on Sept. 7 as the Vienna State Opera opened its 2025-26 season with a star-studded open-air gala concert for the first time. The free, open-air concert was the state opera's latest effort to "open the house to all, especially new listeners," it said in a statement. Among the world-class singers performing were Latvian mezzo-soprano Elina Garanca, German tenor Jonas Kaufmann, Finnish soprano Camilla