Hike to High Point ‘Without a Trace’ at Thacher Park. Join us for a hike to the escarpment on the Fred Schroeder Memorial Trail. 518-872-0800 to register. Meet at the Carrick Road parking, 10 a.m. John Boyd Thacher State Park, Recreation 1 Hailes Cave Rd, Voorheesville.

Dudley Observatory Program & Star Party: Prof. Ralf Schauer (SCCCA) “The Newest Member in Space – The Chinese Space Program” 7 p.m. Octagon Barn; 588 Middle Road in Knox (Delanson 12053 for GPS). For more info: (518) 618-5376.

Gardening Gurus at Albany Book Festival. We’re very excited to offer 3 free public events with Margaret Roach and Ken Druse at SUNY Albany. 1st event starts at 10:30 a.m. at University at Albany Uptown Campus, 1400 Washington Ave., Albany, NY

Science Lecture Series: “Where Did the Trees Go?” Active management practices such as prescribed burns and invasive tree removal are commonly used at the Albany Pine Bush Preserve and other nature preserves across the country. Reservation required, pls call 518-456-0655 or visit www.AlbanyPineBush.org/events. Gather and refreshments starts at 6:30 p.m. at Albany Pine Bush Discovery Center, 195 New Karner Road, Albany, NY

"The Newest Member in Space - The Chinese Space Program" Presented by Prof. Ralf Schauer (SUNY Schenectady). 7 p.m. at Octagon Barn, 588 Middle Road,Delanson, NY 12053.

The Art of Bonsai Pop-Up Exhibition. From 12 to 5 p.m. and on Sunday, 12 to 4 p.m. at Albany Center Gallery, 488 Broadway, Suite 107, Albany, NY. Contact Mohawk Hudson Bonsai Society: Pauline Muth, 518-882-1039,

Art on the Rail Trail (ART) Announces Second Annual Chalk the Walk Event. The event will begin with a family-friendly chalk art contest on the Rail Trail. Event is from 3 to 6 p.m. at the Albany County Helderberg-Hudson Rail Trail, beginning at the pocket park near Stewart’s at 309 Delaware Avenue.

Antiques in Schoharie, Saturday (10 a.m. to 4 p.m.) and Sunday (11 a.m. to 4 p.m.). 143 Depot Lane Center, Rt. 30 Village of Schoharie, NY 12157 2 Miles South of Exit 23 I-88.

Paint 'n' Snack. Onesquethaw Reformed Church. Paint a lovely fall lighthouse scene with oil paints. Reservations are required, call Elise (518) 281-0754 or Deb (518) 872-1704. (Bring an apron or smock and a box to carry your painting home.) Cost is $40. All proceeds will benefit the Camp Fowler Scholarship Fund to help send our children to camp next summer. 1 to 5 p.m. at 11 Groesbeck Road, Feura Bush, NY

After Dark: Pints and Puzzles. Join us at miSci for an evening of libation and scientific exploration for people 21+. Presale tickets are only $12.00 per person. Planetarium shows are an additional $6.00. From 6 to 9 p.m. at Museum of Innovation and Science, 15 Nott Terrace Heights Schenectady, NY