All Ages! Summer, ice cream, special games, and crafts are all planned to take place on the Great Lawn of The Frelinghuysen Arboretum to celebrate the life of its former owner, Matilda Frelinghuysen. Enjoy all this with the background music of a barbershop quartet, Gimme Four! Rain date is July 23. Cost: $20 per person, children under age 2 are FREE. Preregistration is required. To register, 973.326.7603.