Maine’s own Anna Kendrick joined performer Kristin Chenoweth (above left, with Kendrick) onstage during “Trevor Live,’’ an event for The Trevor Project at the Hollywood Palladium on Sunday. The two triple threats performed “For Good,’’ a song from Chenoweth’s Broadway hit “Wicked,’’ based on the novel by local author Gregory Maguire. The Trevor event honored pop star Katy Perry for her advocacy for young people and equality. Supporters in the audience included “Parks and Recreation’’ star (and Burlington native) Amy Poehler. The Trevor Project provides support for lesbian, gay, bisexual, and transgender youth.