Walk and learn
1. Lowell National Historic Park hosts three Wellness on the Walkways walks this weekend. (Free) The first is the Acre Community Ranger Walk, Friday, 10-11:15 a.m., starting at Pollard Memorial Library, 401 Merrimack St. On Saturday, 10-11:30 a.m., take an Urban Hike, a ranger-led walk through downtown Lowell that starts at the Lowell National Historic Park Visitor's Center, 246 Market St. Then, on Sunday, there's a Sketch & Walk Art Program that starts at the Visitor's Center at 10 and ends with an optional art class at The Brush Art Gallery, across from the Visitor's Center.
Head to the farm — in the city
2. The Lowell Farmers' Market is open Friday, noon-5 p.m. — and every Friday through Oct. 25 — in Lucy Larcom Park, 258 Merrimack St., Lowell. Come and get your fresh fruits and vegetables, watch food demonstrations, and bring the kids for music, games and prizes.
Play games in a mobile playground
3. Pelham Public Library, 24 Village Green, Pelham, N.H., hosts the Ultimate Mobile Gaming Truck and Laser Tag on Friday, 2-3:30 p.m., all ages. (Free) That's right — mobile. A 32-foot bus with seven TVs will be on hand for kids ages 6 and up. No registration necessary — just show up and start playing.
4. Got a hankering for some Sinatra? Get down to Hanover Theatre, 2 Southbridge St., Worcester, on Friday, starting at 6:30 p.m., for Jazz at Sunset featuring Michael Dutra and the Strictly Sinatra Band. ($20-$35 about whom The Boston Globe wrote, "His sound is velour to Sinatra's velvet, you really can't tell the difference."
Experience 'Winter' in summer
5. Concord Players, Inc., will perform a special, abridged version of William Shakespeare's "The Winter's Tale" on the lawn of Concord Free Public Library, 51 Walden St., on Friday, 7:30 p.m. (Free) Witness this classic drama of jealousy, love, redemption, regret and revenge. Fair warning: The library is not air-conditioned, but "The Winter's Tale" may cool you down. On Saturday and Sunday, outdoor performances will be held at 5 p.m., but it probably won't be much cooler.
Don't fear the reaper
6. Classic rockers Blue Oyster Cult (you know — "more cowbell!") is back, bringing their hits "Burnin' For You," "Godzilla" and, of course, "(Don't Fear) The Reaper" to Boarding House Park, Lowell, on Friday, 7:30 p.m., as part of the Lowell Summer Music Series. ($49 in advance, $55 day of) Victim of Circumstance opens.
Sail into the Mystic
Into the Mystic: The Van Morrison Experience" is performing Friday, at 8 p.m., at NARA Park Amphitheater, 25 Ledgerock Way, Acton. ($12 before, $15 day of) The concert is general-admission lawn seating, so bring your own lawn chairs and blankets. Refreshments, including beer and wine, will be available for purchase. Doors will open one hour before the concert; if it rains, the show will be canceled. Free parking is available in the Upper Parking Lot of 75 Quarry Road. Additional information and tickets are available online at: actonma.gov/events.
Watch a movie outdoors
8. Worcester Art Museum's Plein Air Film Series kicks off Friday, 8 p.m., with "McQueen," a documentary detailing the life and work of celebrated British fashion designer Alexander McQueen. ($16/adults and seniors; $12/members and students; $6/kids 17 and younger. Enjoy the show, food and drinks in the WAM's Stoddard Courtyard. Visit www.worcesterart.org/events/summer-at-wam/film-series.
Attend a playgroup with your kid
9. The Silver Unicorn Bookstore, 12 Spruce St., Acton, starts a Working Parents Playgroup on Saturday, 9:30-10:30 a.m., for parents with children up to 2 years old. The playgroup is for parents and kids and is tailored to promote parental resilience, social connections, parenting skills and child-development knowledge. Each meeting will also feature discussion, developmentally appropriate playtime, group circle time with songs and storytime.
Gear up for Groton Guitars
10. The Groton Grange, 84 Champney St., hosts Groton Guitars, a night of high-level music performance featuring renowned guitarists Chris McDermott, RD King and Scott Card on Saturday, 7:30-10 p.m. ($15) The three will play solo and together, playing originals and new arrangements of well-known songs. Visit https//grotonguitars.bpt.me.