Help the Polly Hill Arboretum in West Tisbury celebrate the seasonal opening of its Visitor Center and plant sale season on Saturday, May 28, from 10 – 2.  In addition to plants for sale, there will be special tours, garden talks, a tree raffle, family discovery tours, and more.  The Artcliff Diner Food Truck will be on hand with food for sale.  Join Tom Clark for a special 9 am early bird tour.  Free.  For more information, log on to www.pollyhillarboretum.org.