Welcome to Girlie-Pop Woodstock

Early Saturday afternoon at the Daisy Chain Fields festival, in Irvine, California, the 25-year-old singer Eli twirled in a tank top emblazoned with a cartoon guitar while singing songs whose plasticky violins recalled the kind of music played on the Disney Channel in 2004. Dancers waved poles with dresses attached to them as if they were flags. She took out her phone, whose case was shaped like a cute bear, and read some thoughts she’d jotted down. “This journal entry is to show you my…