Frederick Law Olmsted is rightfully considered the father of landscape architecture, and the mark he left on the green spaces of this country is especially evident in the city of Boston—and yes, I’m looking at you, Emerald Necklace. In celebration of the 200th anniversary of Olmsted’s birth, the Emerald Necklace Conservancy—the leading proponent of its namesake, 5.5-mile, Olmsted-designed linear park system that runs from the Fenway into Jamaica Plain and Dorchester—hosts Emerald Necklace Parkfest September 24 from 1–6 p.m. Part of the year-long Olmsted Now: Greater Boston’s Olmsted Bicentennial extravaganza, Parkfest boasts free events at Franklin Park, Arnold Arboretum, Jamaica Pond, Olmsted Park, Riverway, Back Bay Fens and Charlesgate Park. Scavenger hunts and picnic areas can be found at all parks, with highlights including tours, trivia, lawn games, dance and music performances, food trucks and art-making activities at select locations. There’s even a parade at Franklin Park from 5–6 p.m. to cap off a once-in-two-centuries afternoon of revelry sure to entertain the entire family.