The seventh annual Fresh Pond Day is Saturday, a free, all-ages event run by the Cambridge Water Department to celebrate the land, water, wildlife and people at the Fresh Pond Reservation.
Kesher, a progressive Jewish education and cultural organization serving Cambridge for more than two decades, is holding a Purim Carnival from 3 to 5 p.m. Sunday at the Kesher Center for Jewish Learning and Culture, 13 Garden Court, Somerville.