Weir Farm National Historic Site on Nod Hill Road invites families to visit the park on Junior Ranger Day, Saturday, April 15, from 11 to 3, as part of National Park Week. The youngsters are invited to become “official junior rangers.”The Friends of Weir Farm will engage junior rangers of all ages in “Junior Ranger 101.”

Participants will learn about park resources, discover the Weir and Young studios with a junior ranger I-Spy activity, create their very own junior ranger hat, and earn the junior ranger badge.

All of the activities are free and open to the public and will be held rain or shine.

Adult visitors are also invited that Saturday for a special opening of the Weir and Young studios, which do not officially open for the season until May 3.

Information: www.nps.gov/wefa.