SATURDAY, MAY 4

Devens Regional Household Hazardous Waste Collection: OPEN to member communities and their small businesses on the first Wednesday and the following Saturday of the month. 9 a.m. to noon, March through December, 9 Cook Street (rear), Devens. FEE: Household hazardous waste, $20 per 5 gallons/pounds, $40/10 gallons/pounds; other items vary depending on item. MORE DETAILS: www.devenshhw.com, 978-501-3943.

Spring Bird Walk in Groton: The public is invited to join Mark Archambault of the Nashua River Watershed Association (NRWA) for a free guided "Spring Bird Walk" from 7:30-10 a.m., at the NRWA's River Resource Center at 592 Main St. in Groton. In the event of heavy rain, the excursion will be held Sunday, May 5 at the same time. To reserve a spot, please contact Mark at MarkA@NashuaRiverWatershed.org, or call 978-448-0299. People who register after the first 25 spots are taken will be placed on a waiting list.

Health and Wellness Expo: Join us at Emerson Hospital's annual Family Health and Wellness Expo, 9 a.m. to 1:30 p.m., at 133 Old Road to Nine Acre Corner in Concord. Registration is required at 1-877-936-3776 for the following screenings: skin cancer; lipid profile/cholesterol (with a 12-hour fast required); prostate specific antigen (PSA); and thyroid function. No registration is required for chair massage, body fat analysis or screenings for blood pressure, bone density, diabetes, oral cancer, respiratory or postural issues. For information, visit www.emersonhospital.org.

Barn Day Celebration: Come and celebrate our Barn Day from 10 a.m. to 4 p.m. at Hélène's Stables, 435 Martin's Pond Road, Groton. This event is sponsored by United Solar Associates and Hélène's Stables and will gather various vendors from the area: Farmers with produce, spinning their wool, with their animals to be petted and with CSA membership available for purchase; crafters, representatives of alternative energy, native drums and art work, horse rides and more. Food will be served and there is plenty of parking. Come and see all the resources we have in our area! Additional vendors welcome. For more info, call 978-448-6370.

Beavers as Engineers: The Nashua River Watershed Association invites young scientists, ages 7 to 11, from all communities to join us for our Science Saturday program on "Beavers as Engineers" on Saturday, May 4, from 12:30-2:30 p.m., at the historic Williams Barn property, 160 Chicopee Row in Groton. Science Saturday costs $25. Pre-registration is required. To pre-register, please contact Mary Marro at 978-448-0299, or email MaryM@NashuaRiverWatershed.org.

NRWA Outdoor Wellness Walk: Anyone interested in walking for wellness and learning more about ecosystems along the Nashua River Rail Trail is welcome to join the Nashua River Watershed Association's monthly wellness walk from 3-4 p.m. Mary Marro, NRWA Environmental Education director, will be leading this 45- to 60-minute walk. The trail is flat and paved; the walk is open to all ages. No dogs are allowed. We'll meet at the Station Avenue kiosk on the Trail in Groton. Google map and directions can be found at www.NashuaRiverWatershed.org. Pre-registration is encouraged for planning purposes. To pre-register, contact Mary at 978-448-0299, or email MaryM@NashuaRiverWatershed.org. Join Mary for exercise and discussion!

Murder Mystery Dinner Show: Country Day School and Theater with a Twist present "What a Drag," which follows a small theater troupe as members go out to eat for a traditional full costume dinner after the dress rehearsal. To raise excitement, they decide to perform a skit from their show, "The Wizard of Osborne," a drag version of "The Wizard of Oz." Things don't go as planned, however, when the Wicked Witch of the West suddenly dies. Find out whodunit, in this anything but traditional mystery. Join us at the historic Bull Run Restaurant in Shirley. Doors open at 6 p.m. Show starts at 7 p.m. Dinner, desserts and cash bar. Tickets can be purchased at: http://tickets.bullrunrestaurant.com/ for $32.50.

Harvard Pro Musica concert: "Into the Light," a performance of choral music for our times, 7:30 p.m., at St. Matthew's United Methodist Church, 435 Central St., Acton. Tickets $20; seniors/students with ID $16; Children under 12 free. For information: www.harvardpromusica.org.

SUNDAY, MAY 5

Masons breakfast: The Ayer Masonic Association will hold its monthly fundraising breakfast at the Ayer Masonic Center, 11 Sculley Road, Ayer, from 7:30-10 a.m. Menu includes eggs cooked to order or pancakes with bacon or sausage, potatoes, toast, juice and coffee. In addition to the usual menu as outlined above, specials for this month are Eggs Benedict and waffles with strawberries and whipped cream. Come early and bring your friends.

Birding at Oxbow: 7:30 a.m. Come look for breeding populations of migratory birds, but also learn about our resident birds at the Oxbow National Wildlife Refuge. Naturalists Dick and Peggy Knowlton will again be our leaders. It is not uncommon for about 38 different species of birds to be observed during our spring walks! Bring your binoculars and, maybe, a drink. There might be some biting insects. Meet at the Oxbow parking lot at the end of Still River Depot Road in Harvard. Please, pre-register with Rona at 978-779-2259 or by email at ada@FriendsoftheOxbowNWR.org. Program sponsored by Friends of the Oxbow National Wildlife Refuge.

COMING UP...

Country Day School presents "King Midas and the Palace of Gold"

King Midas is the powerful ruler who can think only of gold. The musical follows his story as he acquires this special power and how he quickly learns that greed is dangerous! The show offers lively songs and dance numbers and features students from grades three through five. Performances: Friday, May 10, 7 p.m., and Saturday, May 11, 3 p.m. and 7 p.m. at the Roy Center, Country Day School, 14 Main St., Groton. Tickets can be purchased at the door for $5. For information, call 978 448-5646 or visit www.cdsholyunion.org<;http://www.cdsholyunion.org>;.

Art-In-Nature Opening and Artist-in-Residence meet & greet

Saturday, May 11, 1 p.m., FREE with Fruitlands Museum admission, 102 Prospect Hill Road, Harvard.

Sculptors from our new Art-In-Nature outdoor sculpture exhibit will discuss their work as we take a guided walk across campus to view the sculptures. Our 2013 Artist-in-Residence, Jodi Colella, will also be on hand to talk a bit about the exciting plans she has for her season-long residency.

Job fair

The North Central Career Centers will hold a Job Fair on May 15, from 9 a.m. to 12:30 p.m. at Devens Common Center, 31 Andrews Parkway, Devens. Thirty local employers will be on hand to take resumes, applications and preliminary interviews for jobs in a variety of industries including manufacturing, social services, retail and healthcare. Bring plenty of resumes and dress to meet HR Managers.

Visit www.ccncm.com for more information and a list of participating companies who are hiring, or call 978-534-1481.

Mirror Lake fishing derby

Mark your calendars for the Devens Youth Fishing Derby at Mirror Lake on May 18. Registration begins at 8 a.m. with fishing from 9 a.m. to noon. For questions or to register, contact Kim Walsh at kwalsh@massdevelopment.com or 978-772-8875.