Anita Rogers Gallery will host a show of Aviva Rahmani’s Blued Trees starting Oct. 30, when the opening night will also include a performance and discussion. Rahmani will present excerpts from her Blued Trees opera with dancer Rishauna Zumberg, pianist and arranger Luka Marinkovic, and soloist Alison Cheeseman. Rahmani will then moderate an international participatory streaming event to judge a fossil fuel executive and his wife for ecocide. Doors open at 6:30; performance and discussion 7-8:30p.