Annual Roast Pork Supper at 4:30 p.m. Route 143 in Westerlo across from Hannay Reels. No reservations needed. Roast Pork, mashed potatoes/gravy, sauerkraut, green beans, rolls and homemade cream puffs for dessert. Drinks included. Adults $12, children under 12 $5. Take-outs add $1.

Vendor fair: Warren, Washington, and Albany Counties Chapter of NYSARC, Inc., a nonprofit that supports nearly 1,000 people with intellectual and developmental disabilities,  is hosting a Vendor Fair. 10 a.m. and 4 p.m. at 334 Krumkill Road, Slingerlands, NY 12159.

Holiday Vendor Show, Voorheesville American Legion. 10 a.m. to 3 p.m. Admission is free. There will be a Crock Pot bar and fresh baked goods available for purchase.

Harvest Festival, Farnsworth Middle School, 6072 State Farm Rd. Vendors and crafters. 10 a.m. to 4 p.m.

Bats! at Thacher Nature Center at 2:00 p.m. Did you know that bats are the only flying mammals in the world? Come and learn about these mysterious creatures and the important ecological benefits they provide for humans. Find out about our local bats, where they live, and how they deal with winter. Please call 518-872-0800 to register.

Fall Foliage Hike from 1:00 p.m. –3:00 p.m. Changing foliage is all around. Come and join us for a 2.6-mile hike while we take in the beautiful scenery of this rare ecosystem. Ages 10+. Location: Albany Pine Bush Discovery Center, 195 New Karner Road, Albany, NY. Fee: $3 per person/$5 per family. Registration required. Please sign up by calling 518-456-0655 or visit www.AlbanyPineBush.org/events.

‘Becoming a Fossil’ at Thacher Visitor Center at 2:00 p.m. Celebrate Earth Science Week at Thacher Visitor Center! Why do some creatures get preserved as fossils while others do not? What makes a good fossil anyway? Join us to learn about taphonomy, the science of fossilization, and the conditions that make a good impression in the fossil record. Stick around after the presentation to make your own fossil replica! Call 518-872-0800 to register. Parking fee is $6 per vehicle.

Fall Foliage Walk at Thacher Park at 10:00 a.m. Autumn colors bathe the escarpment during this peak time for leaf peeping. Walk along the Escarpment Trail and marvel at the beautiful colors of fall as we peer out over the cliffs. Along the way learn how to identify some of New York’s native trees, such as maple, beech, birch, and pine. Meet at the Pear Orchard picnic area. Please call 518-872-0800 to register. Parking fee is $6 per vehicle.

A writing workshop: Polishing the Pearls, is planned by the Albany Jewish Community Center on 6 Wednesdays, 1:30 – 2 p.m: October 18, November 1, 8, 15, 29 and December 6 in the Albany JCC’s Massry Senior Center, 340 Whitehall Road.  Marea Gordett leads this series, which is open to those who want to tell a personal story in a unique way.  In this safe and supportive setting, participants will transform moments and experiences almost forgotten, bringing insight and form to them.

Birds Take Flight at 7:30 a.m. –9:00 a.m. It’s that time of year when birds are on the move. Come along on an early morning adventure to observe some of the amazing birds here and see our science team in action as they capture and band birds! They are working together to learn more about birds migrating through the Pine Bush. There will be a short inside presentation followed by an outside observation period, and then back indoors for hands-on activities. Indoor portion will occur rain or shine. All ages.