Public/farmers market at the Riverside Park Pavilion, 8:30 a.m. to 1 p.m.

Hal Shurtleff, director of Camp Constitution, will discuss "Countering Cultural Marxism" at 9 a.m. at Governor's Restaurant. Admission is free. RSVPs appreciated. Call Bob Roy, 207-551-0359.

Roast beef supper at the Southern Aroostook Agricultural Museum, 4:30-6 p.m. $9/person.

Pie and ice cream social at Church of the Good Shepherd, 116 Main St., 11 a.m.-2 p.m. $5/person. Also, indoor yard sale, 9 a.m.-2 p.m.

So You Want to Buy a Telescope, 6 p.m. at W.A. Hansen Library. Roger Libby answers questions about telescopes and deciding which to buy.

Guilded walking tour of historic downtown Presque Isle, with Presque Isle Historical Society, 10 a.m. Begins and ends at Vera Estey House, 16 Third St. Reservations suggested. $2/person. 762-1151.

Guided tour of Presque Isle Historical Society's Vera Estey House Museum, 16 Third St., 1 p.m. Spots limited; $5/person. 762-1151.

Rayno Cote Memorial Golf Tournament, 9 a.m. at Portage Hills Country Club.