Columbia Children’s Arboretum 10040 NE 6th Dr Portland, OR 97211 Refreshments Provided. Please RSVP to vergun@alumni.stanford.edu. Join the work party to plant native trees and shrubs and remove invasive species including Himalayan Blackberry and English Ivy! Look for Joanie Levine and Harriet Cooke, two of our awesome volunteers from the Academies.