The Groton Firefighters Association annual Labor Day Muster and BBQ, Monday, Sept. 1, begins with an 11 a.m. parade, with food available at noon, and muster activities at 12:30 p.m. at the H&V field, 250 Townsend Road, West Groton. Boys Scout Troop 1 will hold a yard sale 8 a.m. to 2 p.m. in conjunction with the event. Donation drop off: Sunday, Aug. 31, from 9 a.m. to 5 p.m. at H&V field. If you need a pick-up at your home, contact Natalie Marsh at 978-448-6481 or natmarsh22@yahoo.com).

The Devens Regional Household Hazardous Products Collection Center is open to Groton residents Wednesday, Sept. 3, and Saturday, Sept. 6, 9 a.m. to noon. Proof of residency is required, and there is a charge for disposal. For information www.devenshhw.com.

Groton Farmer's Market Fridays, 3 p.m. to 7 p.m., at the Williams Barn, 160 Chicopee Road. A variety of homegrown products plus these live musicians: Sept. 5, Shea & Finn McGillivray; Sept. 12, Kenny Selcer; Sept. 19, Howie Newman; Sept. 26, Back to the Garden.

Nashoba Paddler, 398 West Main St., Groton, is offering Full Moon Canoeing, Saturday, Sept. 6, 7:30-10:30 p.m. and Oxbow National Wildlife Refuge Paddle, Saturday, Sept. 20, 10 a.m. to 2 p.m. Registration is required. http://www.nashobapaddler.com/

The Nashua River Watershed Association will sponsor a Hawk Watch and Hike, Saturday, Sept.


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13, time and place TBD. Birder Mark Archambault will lead a 3-hour hike up a mountain to observe thousands of hawks riding the thermals of the Wapack Range during their southward migration. FREE, but limited to the first 20 people who register, 978 448-0299, or email MarkA@NashuaRiverWatershed.org.

What's in your back yard? Identifying Invasive and Native Plants: Susan (Yeager) Black and Mary Metzger will lead a short talk and hands-on walk to learn how to control the common invasive plants in Groton and encourage native vegetation. Saturday, Sept. 13, 1 p.m. Groton Public Library.

The Groton Trails Committee and the Appalachian Mountain Club will sponsor a Guided Hike, led by Olin Lathrop on the Rocky Hill section of the Wharton Plantation, Sunday, Sept. 14, 1-3 p.m. From Route 40 (Lowell Road), take Old Dunstable Road, north for 0.9 miles. Bear left onto Rocky Hill Road (a gravel road). Proceed 0.3 miles to where Rocky Hill Road turns into Martins Pond Road. Park at the sign for Wharton Plantation trails.

Hazel Grove Agricultural Association is hosting its first cross-country derby at the Groton Equestrian Fairgrounds on Jenkins Road, Sunday, Sept. 14, 10 a.m. to 2 p.m. For information see Hazel Grove Groton on Facebook or contact Jean Armstrong at jean@hgaa.org or 978-448-2827 with any questions or to reserve a time. The group will also sponsor a New England Horse & Trail Ride and Versatility Challenge Sunday, Sept. 28, 8:30 a.m. to 4 p.m. to benefit the Hazel Grove Park. For information http://hgaa.org/trailride/

GrotonFest 2014 is scheduled for Saturday Sept. 20, 10 a.m. to 5 p.m. (Rain date Sept. 21) Legion Common, Hollis Street. More than 150 business, nonprofit and artisan booths and all kinds of amazing food, plus continuous entertainment. FREE. Handicapped accessible.

Arts Nashoba presents Saturday Morning Animal Drawing for ages 8-11, for eight sessions, beginning Sept. 20, 10 a.m. to noon, with instructor Marjorie Vaudreuil. For more info or to register online: www.artsnashoba.org

In the Area

Nighthawk Migration Survey, Saturday, Sept. 6, 5:30 p.m. Join the Friends of the Oxbow NWR at Still River Depot Road in Harvard for an evening observing the fascinating migration of the Common Nighthawk through the Nashua River Valley. In the past years, when the weather and insects cooperated, flocks of as many as 100 birds were seen overhead. Rain date will be scheduled for the next day, Sunday. For more information contact Rona Balco, president of Friends of Oxbow NWR, 978-779-2259 or Ada at ada.friendsoftheoxbownwr@gmail.com

As part of its In Thoreau's Footsteps 2014 program, Freedom's Way has planned a Walden to Wachusett Weekend, Saturday and Sunday, Sept. 14 and 15. In conjunction with the New Hampshire Preservation Alliance and Hollis Historical Society, a Hollis Open Barns Lecture and Tour is set for Saturday, Sept. 27, 10 a.m. to 4 p.m. www.freedomsway.org.

NOFA (Northeast Organic Farming Association) will sponsor a workshop on "Sustainability for Massachusetts dairies: Grazing, raw milk, and organic certification," Friday, Sept. 19, 10 a.m. to 2 p.m. at the Sidehill Farm, 59 Forget Road, Hawley. www.nofamass.org. Click on Events.

Middlesex Conservation District Fall Bulb and Perennial Sale will be held Friday, Sept. 19, 3-6 p.m. and Saturday, Sept. 20, 8 a.m. to noon at the 4H Fairgrounds, 51 South Chelmsford Road in Westford. middlesexconservation.org.

The Mass Great Outdoors Blog dedicated to the protection and enjoyment of Massachusetts' natural resources can be found at http://blog.mass.gov/greatoutdoors/

This list is compiled by Mary Metzger mmetzger42@yahoo.com and may be freely shared.