Sesquicentennial Tree Planting and Time Capsule Burial is a community celebration marking Arlington's 150th anniversary at Rotary Dream Park in Arlington. As part of a year-long citywide push to plant 150 trees a month, the event is all about growing forward together. It's a fun, meaningful way to see the city's sustainability and pride in action. Come dig into a little Arlington history, see a new tree take root and feel part of something that will keep growing for decades.