It’s the hottest ticket of the year, and this year’s theme is ¡Viva La Noche! — inspired by the two shows opening the Opera’s 96th season, Pietro Mascagni’s Cavalleria Rusticana and Ruggero Leoncavallo’s Pagliacci. Shannon Cronan and Kathy Huber co-chair the big event on behalf of the SF Opera Guild, and design maestro Riccardo Benavides will work his magic, transforming the War Memorial Opera House into a romantic evening in Buenos Aires. Advance reservations are essential for this perennially sold-out evening! Tickets are priced…