It starts at 2 pm, at 86 Friend Street, and the Amesbury Days kick-off block party starts just a little later at 5:30 at the Huntington Square gazebo (which no one seems to provide an address for, although I'm sure if you're from Amesbury you know it. I think it's on Main Street not far from the Whittier Home.)
Wicked Local Amesbury has the full schedule of events.
Later, on Saturday, June 27 from 2 to 3 pm, the Whittier home hosts one of their monthly teas in the garden. From the Whittier Home website:
Whittier’s love of nature was clearly exhibited in his garden. Today, the descendents of the purple gentian, monarda, and grapevines he wrote about still bloom. Enjoy an elegant tea in the beautiful historic gardens of the John Greenleaf Whittier Home in Amesbury, MA. 2p.m. in the garden. 86 Friend St. $15. Purchase tickets online by clicking our Gift Shop link above, or call 978-38-1337 for reservations.