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

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.

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.

Free public event will be hosted by the environmentally-minded homeowners Becky Meier and Bob Connors at 1409 County Rte 5 Canaan, NY on Saturday, May 19 from 10:00 am to 2:00 pm. They are the co-founders of Community Advocates for Sustainable Energy.

Karner Blue Butterfly Walk on Saturday, May 19, from 10:30 am – 12:00 pm. Today is Endangered Species Day! Don’t miss this chance to join Albany Pine Bush Preserve staff on a 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. Come learn about the natural history of the Karner blue and our efforts to rescue this species from the brink of extinction. Ages 6+.

On Friday, May 18, and Saturday, May 19, The Schoharie Valley Garden Club and the Schoharie Valley Piecemakers Quilt Guild will present a joint Flower and Quilt Show, “Welcome Spring with Petals, Threads, and Leaves,” at the Schoharie Library at 103 Knower Avenue in Schoharie. Friday, May 18, at 3:30 - 6:30 pm and Saturday, May 19, from 11 am - 2 pm.

Celebrate Bike-to-Work Day on Friday, May 18, beginning 8 am at the Albany County Helderberg-Hudson Rail Trail. Walk, stroll, ride, or glide along the Albany County Helderberg-Hudson Rail Trail and show your appreciation for this treasured community resource. You are invited to join MHLC, local public officials, and the New York Bicycling Coalition at this annual celebration. This free event begins a light breakfast at 8 AM at our office at 425 Kenwood Avenue.

Monthly Business Meeting and Cultural Presentation on May 17 at 7:00 p.m. Following the business meeting, the owners of Dancing Ewe Farm will discuss their dedication to preserving the art, technique, and culture surrounding Tuscan-style cheese making, Salumi, and Olive Oil.  Free and open to the Public. American Italian Heritage Association and Museum 1227 Central Avenue, Albany, New York 12205. Call (518) 435-1979 for information.