https://www.arboretum.harvard.edu/
Fragrant, flowering lilacs get their very own celebration on at Boston’s Arnold Arboretum each year. The grounds are home to nearly 400 lilac plants representing 165 different varieties: It’s one of North America’s most significant collections of lilacs.
On Lilac Sunday, picnicking on site is permitted, and special tours and activities for families are scheduled.
Call 617-524-1718 for event details.