7 Halalisa Singers: Under the direction of artistic director Mary Cunningham reprise highlights from their extensive repertoire in Best of The Halalisa Singers: Favorites from 25 Years of Singing. The group's 30 singers includes Ayer resident Bob Williams. They will be accompanied by percussionist Bertram Lehmann and pianist Trevor Berens. Tickets are $20, $15 advance. For information call 781-648-5579, email info@halalisa.org, or visit www.halalisa.org. Saturday, April 7, 8 p.m. at Follen Church, 755 Massachusetts Ave., Lexington. Sunday, April 8, 3 p.m. at Unitarian Universalist Church of Reading, 239 Woburn St., Reading.

Seder at First Parish Church of Groton: 5:30 to 8:30 p.m. All Are Welcome to the celebration of the Jewish Festival of Liberation. Our Seder is for everyone - all ages, all beliefs, Jews and non-Jews alike. Family, friends and guests are invited and especially welcome. We tell the story of how the Israelites were freed from slavery in Egypt and we re-dedicate ourselves to the present day struggle for freedom and justice for all people. If you have never been to a Seder before, this is a wonderful introduction. We explain all the rituals, translate the Hebrew so everyone understands what is being said, and focus on making a meaningful connection between this ancient story and our current circumstances and lives, all in a relaxed, lively, kid friendly atmosphere.


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The Seder is free of charge but donations will be gratefully accepted. Each family will be asked to bring a potluck dish (we can give you recipes as well as guidelines about unleavened foods to bring). For information or to sign up, please call the church office at 978-448-6307 and leave contact information, or email us at dwebster@uugroton.org.

Linen and Flax: In Colonial America most New England farmers grew some flax that could be processed, spun, and woven into linen. At 7 p.m., a display all about linen and flax will open at the Shirley Historical Society Museum. Spinning wheels, yarn reels, and a niddy noddy will be on display along with vintage items made out of linen. Information about the history of flax will be shared and visitors can try their hand at drop spindle spinning. The flax-to-linen display will remain up through the summer and visitors can come see it on Mondays or Saturdays between 10 a.m. and 1 p.m. The Museum is located at #182 Center Road in Shirley. For more information, telephone 978-425-9328 or email mail@shirleyhistory.org.

10 The Role of Tea in the American Revolution: 7 p.m., Lawrence Library, Pepperell. Danielle Beaudette of the Cozy Tea Cart in Brookline, New Hampshire, will lead the discussion.

Wonderful World of Worms: Groton Grange # 7 invites you to the third lecture in the 2018 Agricultural Lecture Series, 7 p.m. at the Grange Hall, 80 Champney St., Groton. The Wonderful World of Worms will be presented by Clio Fisher. Huge, big, little, littler and really tiny, worms come in all sizes and they do all sorts of fantastic things here on Mother Earth. Worms plow, bury, fertilize, eat garbage, bait hooks, and they think ... or something very close to it. They have amazing abilities that make them the superheroes of the earth. There will be a bowl of gummy worms for you to try in case you have never eaten a worm before. Parking allowed only on the Grange side of Champney Street.

Audiobooks and Your Empire of Words: Groton Public Library, 7-8:30 p.m. Ever wonder how audiobooks get made or how to start producing your own? Audiobook voice-actor and producer Colby Elliott will show you how it's done! Come learn about this unique, local business!

11 Let the Landscape Speak: Indigenous Ceremonial Stone Structures in the Northeast: 6:30 to 8:30 p.m., Lawrence Library, 15 Main St., Pepperell. The forests of New England are dotted with living prayers of stone (Ceremonial Stone Landscapes) created by the Indigenous peoples of this region. The traditional belief is that these stone structures were placed to create and restore harmony between human beings and Mother Earth. The prayers they embody continue to live as long as the stones are kept intact. Doug Harris, deputy tribal historic preservation officer for the Narragansett Indian Tribal Historic Preservation Office will give an illustrated talk about the various forms of ceremonial stone landscape in our area and how you can help preserve them. This program is supported in part by a grant from the Pepperell Local Cultural Council, a local agency which is supported by the Massachusetts Cultural Council, a state agency.

Preparing, Dividing, Planting, and Soil Improvement by Weston Nurseries: 6:45 p.m. at the Pepperell Senior Center, sponsored by Pepperell Garden Club. $5 guest, $2 seniors. All welcome and refreshments served. This lecture will help us with a great spring start.

Invasive Species: Groton Invasive Species Committee will hold a session on the Emerald Ash Borer, Legion Hall, 75 Hollis St., Groton. Refreshments and networking at 6 p.m., presentation at 7 p.m.

Understanding and Responding to Dementia-Related Behavior: The Alzheimer's Association will present a free program on behaviors associated with dementia from 6-7:30 p.m., at the Townsend Council on Aging, 16 Dudley Road. To register or for more information visit alz.org/MANH

12 Friends of Lawrence Library Pepperell: 10:15 a.m. at the library. Come discuss plans for future activities at the library. Free babysitting is available and refreshments served.

Sisters In Crime: Ayer Library, 6:30 p.m. A panel of accomplished crime authors, Kate Flora, Ruth McCarty and Leslie Wheeler will discuss how real-life events inform their work.

14 Amethyst Chamber Ensemble: Debut concert at St. Andrew's Episcopal Church in Ayer, 7 p.m., exploring a range of vocal and instrumental chamber works with a flexible and accomplished roster of artists. Amethyst's program includes: William Bolcom's Let Evening Come; the viola sonata in F minor by Johannes Brahms; Brahms' Zwei Gesänge; songs by Irving Schlein; and selected songs in the tango style, by Astor Piazzolla. Artists include soprano Mary Sullivan, mezzo-soprano Joelle Morris, Jon Poupore on the viola, and Scott Nicholas on the piano. Tickets are $15 for adults, $10 for students and seniors. For tickets and more information, please visit www.standrewsayer.org

15 Nashua Valley Model Railroad Association: Open house, 10 a.m. to 4 p.m., 2 Shaker Road, Shirley. Attractions include the operation of our 2,000-square-foot model train layout which depicts the Boston and Maine Railroad running from Portland Maine to Mechanicville, New York. Multiple trains with sound will be running and will be fun for both young and old. Model railroad enthusiasts are encouraged to attend.

18 Ed the Wizard: "Reading is Magic," will appear at the Ayer Library starting at 10:30 a.m. Inspired by the book series "Harry Potter," Ed the Wizard weaves together the importance of building and maintaining one's reading skills with his interactive magic performance. This program is supported in part by a grant from the Ayer Cultural Council, a local agency which is supported by the Massachusetts Cultural Council, a state agency.

21 Groton Litter Clean-Up: Groton Grange #7 is holding its annual Town-wide Litter Cleanup on Saturday, April 21 from 9 a.m. to 4 p.m., and Sunday, April 22 from 11 a.m. to 4 p.m. Our booth will be in front of the Prescott School on Main Street. We will have the Bikes not Bombs organization with us again. They will be accepting used bikes to be re-conditioned for distribution around the world. They will be there on Saturday from 9 a.m. to noon. There will be a $10 donation to cover their cost for re-conditioning the Bikes. Gloves and trash bags will be provided for those who join us in the Town-Wide Litter Cleanup.

Finding and Shaping your Story with Paul Hertneky: Seven Bridges Writers Collaborative,10:30 a.m. to 12:30 p.m., Thayer Memorial Library, 717 Main Street, Lancaster.

22 Energy Healing with Hannelore Nalesnik: An introduction to energy healing, a practice to activate the body's subtle energy systems to remove blocks and stimulate healing, 2 p.m., Groton Public Library.

27 Spring Plant Sale: Friday, 3-6 p.m., and Saturday, 8 a.m. to 12 p.m. at Kimball Farm, 400 Littleton Road, Westford. All items may be ordered in advance through March 31; to place an order visit middlesexconservation.org or call 978-692-9395 to request a catalog. The sale includes tree/shrub seedlings, perennials, fruits, groundcovers and garden supplies. All sale proceeds benefit environmental programs, protecting soils and waters in Middlesex County.

The Glass Menagerie: Presented by the Dunstable Theater Collaborative, April 27-28, May 4-5, 8 p.m.; April 29, 2 p.m. Tickets $10-12. Dunstabletheater.org.

28 TAG: You're It: Ayer Shirley Regional High School Drama presents its second annual TAG sale, 9 a.m. to 4 p.m. at the high school. Proceeds benefit the Drama Club.

29 Concert: The Virginia Thurston Healing Garden will host Indian Hill Cello Ensemble, led by Indian faculty member Cynthia Forbes, at 3 p.m.. Enjoy the beautiful setting of the Healing Garden, combined with phenomenal acoustics, as you listen to a variety of classical works. The Healing Garden, a non-profit organization, is located at 145 Bolton Road in Harvard and offers support, educational and therapeutic services to those affected by cancer. Admission is $15 (tickets only sold at the door). All proceeds benefit the services of the Healing Garden. Visit healinggarden.net for event updates or cancellations.

Speaker on Slave Trade: The Groton History Center and the Groton Public Library present Dr. Margaret Ellen Newell, from 2 to 4 p.m. in the Sibley Room at the Groton Public Library. Dr. Newell, a professor of History at The Ohio State University, has spent years writing about the Colonial economy and race relations in America. Her latest book, "Brethren by Nature: New England Indians, Colonists, and the Origins of American Slavery" reveals this little-known aspect of American history.

May

19 Armed Forces Day: Open House at the Fort Devens Museum, 10 a.m. to 4 p.m.