Katy Perry and Maroon 5 will headline this summer's (17) Wango Tango pop festival in Carson, California. The annual KIIS FM event will also feature performances by One Direction star Niall Horan, Zedd, MAChine Gun Kelly, Camilla Cabello, Hailee Steinfeld, Noah Cyrus, Halsey, and Alessia Cara. This year's pop extravaganza will take place at the StubHub Center on 13 May (17).