LOCAL EVENTS ON SATURDAY

Light physics

POTSDAM: North Country Children’s Museum, 10 Raymond St., will host physicist Dave Bradford with an interactive science program where kids will explore the nature of light; beyond reflection, museum visitors will be guided through hands-on activities that may seem like magic, the bending of light, the colors of the rainbow, disappearing objects, and more, all while learning about the scientific method; for families with children 12 and younger; no pre-registration necessary; free with the cost of admission or membership; 1 p.m.; northcountrychildrensmuseum.org, 315-274-9380.

43rd annual Ogdensburg Expo

OGDENSBURG: 43rd annual Ogdensburg Expo at the OFA Golden Dome, 1100 State St.; concessions, carnival games, exhibits featuring automobiles, boats, crafts and products of all kinds, live entertainment, raffles; $5 per adult, $4 per child, and $20 for a family of 5 or more; 10 a.m. Expo opens; 10:05 a.m. Lighthouse Band; 10:30 a.m. OFA Middle School Band; 11:30 a.m. OBGC Stepping with Sydney and Club Talent; 12 p.m. St. Johns Conservatory Players; 1 p.m. Ogdensburg Dance Studio; 2 p.m. Father Dennis and the Faithful; 3 p.m. Deja Blue; 4 p.m. 95.3 Wolf Down Hot Dog Eating Contest; 5 p.m. Julies Dance Studio; 6:45-8 p.m. Pat Duffy and Friends (Aeonian).

Open House

NORFOLK: Open House at the Norfolk Historical Musuem, 42 ½ W. Main St., 1-3 p.m.

Art exhibit opens

OGDENSBURG: K-12 Art Show “Portraits” opens, noon-4 p.m., James Montpelier Gallery, Ogdensburg Free Academy.

Tracking signs

MASSENA: Free nature walk with guide to track signs of wildlife: 2 p.m; Nicandri Nature Center, 19 Robinson Bay Rd; www.massenanaturecenter.com.

Cabin fever picnic

POTSDAM: Cabin fever picnic, 4-6:30 p.m., Potsdam United Methodist Church; downstairs, handicapped accessible; pulled pork on a bun, macaroni salad, cole slaw, baked beans, cookies, beverage; $9, children 5-10 $5, under 5 free.

Rib on a roll

MASSENA: Prime rib on a roll with macaroni salad, 4 p.m., Massena VFW Post 1143; $6, open to public.

Maple breakfast

WEST STOCKHOLM: West Stockholm Fire Department Auxiliary serving a maple breakfast, 8-11 a.m., at the station; pancakes, French toast, bacon, sausage, orange juice and coffee.