Early Spring Wildflowers at Thacher Park. 10 a.m. Woodland wildflowers known as spring ephemerals bloom on the forest floor before the trees leaf out and block the sun. Meet at the Paint Mine picnic area. Call 518-872-0800 to register.

Schoharie Valley Hayshakers will hold a mainstream level western square dance at the Middleburgh Elementary School cafeteria from 7:30 until 10 p.m. The caller is Ray Taylor. Phone 518 827-4894

Guilderland Historical Society Michael Barrett will present “Troy’s Tiffany Treasures,” describing the artistic creations in glass produced by Louis Comfort Tiffany and his studio. Barrett is the Executive Director of the Hudson-Mohawk Gateway. Free. 7:30 p.m. at the Mynderse-Frederick House,  51 Route 146, Guilderland Center. 518 861-8582.

Albany Pine Bush Preserve Commission will host its annual Earth Day celebration at the Discovery Center on Saturday, April 21, from 9 a.m. - 12 p.m. at 195 New Karner Rd, Albany, NY

Thiers Memorial Fly-In & Car Show, hosted by the RPI Flying Club will begin at 10 am on Saturday, April 21, and run until 3 pm. At the Empire State Aerosciences Museum at 250 Rudy Chase Dr. Glenville, New York 12302. Come check out an LC-130 (used in missions to Antarctica) from the 109th Airlift Wing, 2 LifeNet helicopters, a Mohawk Ambulance, and a fabulous Car Show. Independent Helicopters will offer helicopter rides. A crash truck will do a demonstration at 12 pm. Great food from “Livin’ the Dream”.

Earth Day Story Walk with the Bethlehem Library: For Preschoolers and Parents on Friday, April 20, at 10 am at the Swift Preserve, Delmar, NY. In honor of Earth Day 2018, we are partnering with the Bethlehem Library to offer an outdoor story walk for preschoolers and their parents. We'll take a short walk through the Swift Preserve, noticing the amazing plants and animals that surround us, before sitting down to enjoy a story in the open air.

April Lecture. Images of Childhood 400 Years Through Time on Thursday, April 19, at 7 pm at the Cedar Hill Schoolhouse Museum 1003 River Road, Selkirk. Bethlehem Historical Association.

On Tuesday, April 17 at 7:30 p.m., Sara Nović, acclaimed first-time novelist and a notable figure in the American deaf community, and Peter Golden, author of the new novel Nothing Is Forgotten, will read from their works and discuss the writing process in the Huxley Theatre, NYS Museum, Cultural Education Center, 222 Madison Avenue, Albany.

Shake, Rattle and Contra Dance! April 17 & May 1st from 7 to 9:30 pm with an introductory session for Beginners at 6:45 pm. Enjoy live music, fun, and entertainment for both beginners and seasoned dancers alike. No experience necessary, no partner needed. Contra dances are similar to square dances with long lines of couples dancing together. Dances are first taught and instructions are called throughout the dance. Callers, Michael Kernan (April) and Melanie Axel-Lute (May), with music provided by the Capital District Megaband, conducted by George Wilson.

Felting Workshop 10 a.m. to 1 p.m. 518-456-7890 or shakereducator@gmail.com www.shakerheritage.org   Shaker Heritage Society 25 Meeting House Road Albany, NY  12211.