Caves & Karst. Starting with the karst display in the Visitor Center, participants will come to understand the development of Thacher Park's unique landscape. We will caravan to two additional areas in the park to observe their unique geology. 9:30 a.m. at Thacher State Park Visitor Center

Fall Foliage Walk. Come join us for a 2.6-mile hike through the Karner Barrens region of the preserve and take in the beautiful scenery of this rare ecosystem.  Reservations required. Visit www.AlbanyPineBush.org/events or call (518) 456-0655. at 11 a.m. at Karner Barrens trailhead (#1)

The Second Sunday Series at The Gallupville House.  Mark your calendars for a rich experience of Roots and Folk music that will have your feet moving at 3 p.m. at The Gallupville House 913 NY-443, Gallupville, 12073

Albany Fall Stamp and Postcard Show. Free admission and parking. Hosted by Fort Orange Stamp Club.  fortorangestampclub.org. 9:30 a.m. to 4 p.m. at  American Legion Hall 4 Everett Rd. Albany, 12205.

Legion Breakfast. The Voorheesville American Legion is having Breakfast  All your favorite breakfast goodies are included. Cost $10  Adults $5 Children Take out Available from 8 to 11:30 a.m. at The Voorheesville American Legion 31 Voorheesville Ave, Voorheesville, 12186,

Gongs Along the Mohawk: A Sound Immersion.  Joining them in this immersive  journey is guitarist Scott Collins, whose exotic sounds are with tremendous passion and pyrotechnical velocity. 1 to 3 p.m. at Mabee Farm Historic Site 1100 Main Street Rotterdam Junction, 12150.

Slingerlands Living History Walking Tour. Participants will enjoy an afternoon walking tour in the hamlet of Slingerlands that features costumed actors portraying local notables like Congressman John I. Slingerland and engineer William H. Slingerland.  tickets can be purchased at https://slingerlandvault.eventbrite.com. from 2 to 3 p.m. at Slingerlands Fire Department, 1520 New Scotland Road.   

Fall Preparation for Better Soil Health. Regional Capital Area Agriculture & Horticulture Program is pleased to present Fall Cut Flower Field Day. We will talk about a few practices you could implement to build better soil and help give your cut flowers a head start for next season. Cost $5 per person and  $8 for residents of all other areas. 1 to 3 p.m. at Tiny Hearts Farm, County Rte 7A, Copake, 12516 

History lecture. The American Revolution on the Spanish Borderlands - Webinar. The New York State Library is pleased to host Kathleen DuVal, Ph.D. Please register for this online program https://nyslibrary.libcal.com/event/9193665. 11 a.m. via virtual

Some Things Different with Andy. Each time we'll present a variety of topics, stories, news, poems, tips, experiences, and other interesting items. Community Caregiver's Lunchtime Chat. 1 p.m. via free conference call at 518-992-6661.