THURSDAY, SEPTEMBER 21:

  • “Climate Change: What It Means for St. George,” 1 p.m. at Jackson Memorial Library, Tenants Harbor. Laurel Watts, PhD, a scientist with the National Oceanic and Atmospheric Administration in Boulder, Colorado, gives the talk while she is on a visit to her hometown.
  • 2017 George J. Mitchell Lecture on Sustainability, 1 p.m. Hauck Auditorium at UMaine Orono. Thomas Dietz, PhD, lectures on “Facts versus Values: How Can We Make Better Decisions?” With remarks by Sen. George Mitchell. The lecture is free and public, but tix are required: umaine.edu/mitchellcenter.
  • Famed Captains and Shipbuilders Trolley Tours, 4 p.m. Thursdays through Oct. 26. Hosted by Maine Maritime Museum and Red Cloak Haunted History Tours. The trolley departs from the Bath museum and passes grand homes on the way to Oak Grove Cemetery for a guided walk led by the Lady in the Red Cloak. Registration: mainemaritimemuseum.org or 443-1316.
  • Talk on Citizen Science, 6:30 p.m., Rockland Public Library. Learn what it is and how you can get involved from expert Sarah Kirn of the Gulf of Maine Research Institute. She will tell stories from more than 15 years of work in citizen science and discuss current scientific research that you can participate in.
  • “Bat Exceptionalism: Prepare to Be in Awe of Bats,” 7 p.m., first in Midcoast Maine Audubon’s fall 2017 speaker series at Camden Public Library. Bat champion Annie Kassler shows close-up images and talks about the vast ecological contributions these winged mammals make to the planet’s health.

FRIDAY, SEPTEMBER 22:

  • Folk Dance Brunswick, 6:30-9 p.m. at People Plus, 35 Union St., Brunswick. World music & dance. All welcome. $5 donation. FMI: 200-7577, folkdancebrunswick.com.
  • “Our Mountain Voices” at Camden Opera House, 6:45 p.m. The Coastal Mountains Land Trust show features poets, dancers, musicians and artists and marks the start of the community phase of the $4.2 million Round the Mountain Collaboration to conserve 1,400 acres around the area’s water supply. $25 tix: coastalmountains.org.
  • 2017 Common Ground Country Fair, Fri.-Sun., Sept. 22-24, Maine Organic Farmers and Gardeners Association’s Common Ground Education Center in Unity. Gates open at 9 a.m. each day. FMI: mofga.org, 568-4142.
  • Train Service to Common Ground Fair, Fri.-Sun., Sept. 22-24, departing from Thorndike and Unity. Belfast & Moosehead Lake Railroad offers rides every 20 minutes between 8:40 a.m. & 6 p.m. on Fri. & Sat., and between 8:40 a.m. & 5 p.m. on Sun. Thorndike depot: Farwell Mill buildings, Rte. 139, east side of the track (with refreshments, live music and free tours of the mill.) Unity depot: Envirem Organics on Cornshop Rd., just off Rte. 220. $15 adults/$5 kids. Combo train & fair tix: $23 adults/$20 srs. FMI: belfastandmooseheadlakerail.org.

SATURDAY, SEPTEMBER 23:

  • World War I Day at Montpelier in Thomaston, 10 a.m.-3 p.m. Re-enactors of the 103rd Regiment will be drilling and showing off their gear. Maine Military Historical Society will display World War I weapons. Inside Montpelier, the white mansion at the top of the hill on Route 1, will be a display of aeronautical artifacts from Owls Head Transportation Museum, plus documents & photographs. $8 adults/$4 ages 5-13/free under 5.
  • Annual Public Policy Forum and Award Presentation, 4 p.m., Kresge Auditorium, Bowdoin College, Brunswick. During the forum, author and New Yorker staff writer Jane Mayer will receive the Frances Perkins Center Intelligence & Courage Award. She is the author of “Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right.” Free; public is invited, but limited seating & tickets are required. FMI/tix: 563-3374, ccash@francesperkinscenter.org.
  • Friends of Fort Knox 25th Anniversary Celebration, 1-5:15 p.m. The volunteer fund-raising group that has restored the Fort celebrates with talks, tours, cannon firing, music, entertainment, roaming clowns & swashbuckling. FMI: fortknox.maineguide.com.

SUNDAY, SEPTEMBER 24:

  • Free Open House at Donkey Rescue, noon-4 p.m. Visit Peace Ridge Sanctuary in Brooks and see how the nonprofit cares for more than 250 farm animals rescued from abuse and neglect. Another open house is set for Oct. 29.
  • Pemaquid Oyster Festival, noon to dusk. The celebration of the working waterfront and Damariscotta River where the Pemaquid oyster is farmed takes place at Schooner Landing Restaurant & Marina on Main Street in Damariscotta and at nearby businesses. With entertainment, food, exhibits, rides to oyster farms on Damariscotta River Cruises’ RiverTripper, and lots of oysters. Benefit for the Edward A. Myers Marine Conservation Fund.
  • Lighthouse Legends and Lore Boat Cruises, offered at 2 p.m. every Sunday through Oct. 29 by the Maine Maritime Museum and Red Cloak Haunted History Tours. The Merrymeeting departs from the Bath museum’s dock and cruises past up to seven lighthouses, depending on the weather. Cash bar and snacks available. You may bring food and nonalcoholic beverages. $65 adults/$42 ages 6-12/$5 under 6. Registration: 443-1316 or mainemaritimemuseum.org.

WEDNESDAY, SEPTEMBER 27:

  • Listening Session with Gubernatorial Candidate Diane Russell, 7 p.m., Watts Hall, Thomaston. Citizens invited to share their ideas and concerns for Maine’s future, sponsored by Knox County Democrats. Refreshments. FMI: KCDC Events Committee chair Nancy Davis nancydaviscap@yahoo.com.

THURSDAY, SEPTEMBER 28:

  • “Summertime Shindig” of Kennebec Estuary Land Trust, 5:30 p.m. at Bath Freight Shed. Enjoy views of the river, nosh on hors d’oeuvres, sip wine or local beer, and celebrate KELT being named Maine’s 2017 Best Land Trust by readers of Down East magazine. Proceeds from $60 ticket sales and the silent auction support KELT. FMI: kennebecestuary.org.
  • Author of “One Man’s Maine” at Camden Public Library, 7 p.m. Jim Kroschell talks about his book and what he loves about Maine. Copies available for purchase and signing.

COMING UP:

  • “Wax Wings,” Fri., Sept. 29 at 7 p.m., and Sat. & Sun., Sept. 30 & Oct. 1 at 3 p.m., Camden Opera House. Performance with cast of musicians, actors, dancers and artists, written by Kristi Williamson. Art show, reception and talk in the Tucker Room follows each performance. $20, FMI: waxwingstheater.com or Kathryn Oliver, WaxWingsTheater@gmail.com.
  • 18th Annual Tour de Farms, Sat., Sept. 30. Midcoast bicycling tour with stops at farms, orchards, creameries and a brewery. Options include rides of 42 or 56 miles and a 17-mile family ride. Rain date is Sun., Oct. 1. After the ride, cyclists and non-riders alike are invited to a barbecue (with vegetarian options) at host Morris Farm Trust. Tickets: morrisfarm.org.
  • East Coast Ghost Trackers to Lead Spooky Tour of Fort Knox, in Prospect, Sat., Sept. 30, 6-11 p.m. Spend the night at the fort and take a guided tour in search of ghosts and paranormal phenomena. Minimum age is 18 or 12 with an adult. Advance registration required: 469-6553.
  • Harbor Arts Festival at Camden Public Library, Sat. & Sun., Sept. 30 & Oct. 1, 10 a.m.-4 p.m. Juried show with more than 50 artists and craftspeople.
  • “Memory & Story” Workshop with Author Susan Shetterly, 3 Saturdays, Oct. 7, 21 & Nov. 4. 10:30 a.m.-3 p.m. Master class addressing central aspects of writing a memoir, and will include feedback on students’ manuscripts. Shetterly is the author of “Settled in the Wild,” winner of the 2011 Maine Literary Award for Nonfiction. $225 MWPA member/$375 non-member. FMI: mainewriters.org.