TOP OF the Rock, the observation deck at Rockefeller Center, will host a special Halloween celebration for New York families, on Saturday, Oct. 31, from noon to 3 p.m. Throughout the afternoon, children can enjoy face painting, magic shows, crafts and sweet treats, while all members of the family will witness the stunning 360- degree panorama of Manhattan. Access to this event is free with the purchase of a Top of the Rock ticket. For more information, call 212-698-2000.

WAVE HILL, located at West 249th Street and Independence Avenue, will host its next Family Art Project on Saturday and Sunday, Oct. 31 and Nov. 1, from 1 to 4 p.m., in the Kerlin Learning Center. During this week’s Halloweenthemed activity, titled “River Masquerade,” visitors will first design their own mask or costume in order to become a river-dwelling creature. Then, all participants will be invited to wear their newly created outfit in a parade of river life celebrating the Hudson. This program is free with paid grounds admission. For more information, call 718-549-3200.

THE RIVERDALE Library, at 5540 Mosholu Ave., presents the following upcoming programs for kids:

• Baby Story Time, a special program for infants up to 18 months old, will be held on Thursdays, Oct. 29 and Nov. 5, at 10:30 a.m. on both days. Participants and their parents can enjoy great books, as well as lively songs and fun rhymes, while meeting other neighborhood babies. Pre-registration is required.
• The children’s librarian will present bone-chilling tales from around the world, during a special Halloween Story Time program for ages 8 to 12, which will be held today, Thursday, Oct. 29, at 4 p.m.
• On Friday, Oct. 30, at 3:30 p.m., the library will host the next meeting of Fun Fridays, a new weekly program for ages 8 to 12. Participants will have the chance to play a variety of board games, as well as enjoy other fun activities, with staff members and other children their age.
• The library presents Toddler Story Time, for ages 18 months to 3 years old, on Tuesday, Nov. 3, at 10:30 a.m. During this program, participants will enjoy interactive stories, action songs and finger plays, while interacting with other toddlers in the neighborhood. Preregistration is required.