Karner Blue Butterfly Walk. 1 to 2:30 p.m. 0.9-mile hike to see the Karner blue butterfly. Once common in the glacial Lake Albany sand belt, the Karner blue has plummeted in numbers over the past 40 years and is now listed as a federally- endangered species. 195 New Karner Road, Albany, NY. Fee: $3 per person/$5 per family. Registration required.

Square Dance at Mabee Farm at 7 pm. All skill levels are welcome, so don’t be shy now! Food and drink will be available for purchase. $10 per person

Dessert Theater at Altamont Reformed Church. The Hilltowns Players will present their spring 2018 comedy  performance “Carol Burnett Show Sketches and Skits” Dessert Theater at 7:30 p.m. in Fellowship Hall, Altamont Reformed Church, 129 Lincoln Avenue. $10 per person/$25 per family. Tickets are available at the door the night of the performance. 518-861-8711.

Cornell Cooperative Extension Albany County Master Gardener Plant Sale takes on a Different Twist from 9 a.m. to 1 p.m. Cornell Cooperative Extension Albany County, 24 Martin Rd, Voorheesville.

Edible & Medicinal Plants of the Rail Trail with Ondatra Adventures from1 to 4 p.m. Where: Albany County Helderberg-Hudson Rail Trail.

Donation Roast Pork Dinner from 4 to 7 p.m.at the Dormansville United Methodist Church at CR 312 in Dormansville. Take outs available.

Native Plant Sale at Thacher Park Overlook. Saturday and Sunday. 10:00 a.m. to 3 p.m.  The sale theme is “Beauty and Beyond”, featuring plants with blossoms and beauty for all seasons.  Native plants can fill those difficult areas as well as bring gorgeous color throughout the year. Call 518-872-0800 for more information.

Birding with Rich Guthrie at Thacher Nature Center at 8 a.m. We’ll start at the Nature Center feeders and head out on the trails. Beginners are welcome, and binoculars are available to borrow. Call 518-872-0800 to register.

The Empire State Aerosciences Museum at 250 Rudy Chase Dr., Glenville, NY will be hosting its monthly all you can eat breakfast from 8:30 to 10:30 a.m.

Trap shoot to benefit Hilltown Community Resource Center Food Bank. Noon. All firearms must be unloaded until you are on the firing line. Helderberg Rod and Gun Club 386 Quay Rd. Altamont, NY 12009. 518-441-2160.