Next week is Arbor Week in Seattle, and they have plenty of events planned. Fall is a good time of year to plant trees in the Pacific Northwest, since the weather is generally mild and the rainfall is plenty so you don't have to worry about watering. Check out their website for tree-related activities and webinars, and be sure to share a tree story if you have one! 

http://www.seattle.gov/trees/get-involved/arbor-week-2020