Cho-A(CRAYON POP), July 22, 2015 : Choa of Korean girl group Crayon Pop attends the promotional event for their new single "ra ri ru re" at Lazona They performed the opening act for Lady Gaga's "ArtRave: The Artpop Ball They performed the opening act for Lady Gaga's "ArtRave: The Artpop Ball concert tour" in twelve cities across North America on 2014.