Lilac Tours May 6 – May 13, various times https://arboretum.harvard.edu/events/event-signup/?id=69384 Lilacs are blooming in the Arboretum throughout the month of May, not only on Lilac Sunday! Join Chris McArdle and other docents on a 45-minute amble up the hill from the ponds to see the lilacs, enjoy their scents, and hear the stories of the many different lilacs in our collection.