Tenors Lando Bartolini and Giorgio Tieppo have...

Tenors Lando Bartolini and Giorgio Tieppo have agreed to switch dates as Calaf in Puccini’s “Turandot” at the Orange County Performing Arts Center in Costa Mesa, according to an Opera Pacific spokeswoman. Bartolini will replace Tieppo at the Thursday performance; Tieppo will replace Bartolini on March 2. Bartolini will sing on Saturday and Tieppo on March 4, as originally announced. In addition, the company is offering teachers half-price tickets to performances of “Turandot” on Thursday and Mozart’s “Don Giovanni” on Friday. For information, call (714) 979-7000.