You guys, we live in a golden age of song mashups. No one knows that better than the talented and imaginative folks behind the Transcendence Theatre Company, and they’ll show off their tour-de-force performance power this week in ‘Oh What a Beautiful Mashup.’ The company behind the summer tradition “Broadway Under the Stars” welcomes guests to a night of musical medleys and special VIP packages. A pre-show reception and toast gets you on the Historic Napa Valley Opera House stage for an uplifting collection of songs from performers Stephan Stubbins and Leah Sprecher. It’ll all make for a lively night when the Mashup goes down on Sunday, April 12, at City Winery, 1030 Main St., Napa. 5pm. $35–$100. 707.260.1600.