It’s last call for this opera among the ruins, as Mill City Summer Opera’s contract with the Minnesota Historical Society has not been renewed. The ruins will continue, however, to be one of the most dramatic stages for any sort of event, including theatrical presentations showcasing the human voice. Mozart’s Cosi fan tutte has been selected, a work considered risqué and vulgar in earlier centuries, but now frequently performed despite its narrative of sisters loyal to their husbands but cruelly tricked by the selfsame to the brink of infidelity. You can also see opera at a bar this summer, as Pergolesi’s La Serva Padrona will also be performed by the group at Icehouse on July 15 and 17. For tickets, go to www.millcitysummeropera.org.