Sunday, April 16

Down Home Up Here Bluegrass Festival from 10 a.m. to 11 p.m. at Club Passim, 47 Palmer St., Harvard Square. $15 for a day pass. The 11th annual festival features three days of bluegrass and old-time acts, with some workshops mixed in among the concerts and jams. Information is here.

Musicians from Marlboro at 3 p.m. at the Longy School of Music, 27 Garden St., Harvard Square. $30. Mendelssohn, Wiancko, Kurtág, Kirsten and Beethoven from the traveling group with violin, viola, cello, double bass and soprano. Information is here.

“Taking the Long View” dance (continued) from 7 to 8:30 p.m. at The Dance Complex, 536 Massachusetts Ave., Central Square. $25. Pat Catterson and Molissa Fenley present works reflecting on their influential careers in modern dance. Information is here.

Monday, April 17

Patriots’ Day celebration from 10 to 11:30 a.m. at Foss Park, 219 Broadway, Winter Hill, Somerville. Free. A colonial fair with refreshments from the era and games. Attendees are encouraged to wear colonial garb too. Information is here.

Patriots’ Day observance from 10:30 a.m. to 2 p.m. on Cambridge Common, near Harvard Square. Free. A reenactment of William Dawes’ historic horseback ride from Boston to Cambridge alerting the colonists of the British threat of 1775 ensures the day hits its historical mark, and there will be talks about the ride and Prince Hall, the black revolutionary soldier and founder of the Prince Hall Masons. But there’s also entertainment from the Northend marching band, Kemp Harris and the Dave Macklin Band as well as face painting, glitter tattoos, balloon art, a magician, juggler and more. A food truck has free hot dogs, hamburgers and cannolis for veterans, police, fire and other first responders. Information is here.

Margot Douaihy (via tha author’s website)

Margot Douaihy reads from “Scorched Grace: A Sister Holiday Mystery” at 7 p.m. at Harvard Book Store, 1256 Massachusetts Ave., Harvard Square. Free. The start of a series about a punk rocker turned nun intended to breathe life into the genre of hard-boiled mysteries. She will be in conversation with Kelly J. Ford, author of “Real Bad Things.” Well-fitting masks are required. Information is here.

Tuesday, April 18

Yumi Izuyama. (Photo: Japanese Paper Theater via Facebook)

Kamishibai Japanese Paper Theater with Yumi Izuyama from 10:30 to 11 a.m. at the Somerville Public Library, 79 Highland Ave., in the Winter Hill neighborhood. Free. A story about a monarch butterfly told in English and Portuguese using an art technique most popular during the 1930s and the postwar period in Japan. A craft activity follows. Information is here.

Neighborhood Bird Watching from 4:30 to 5:30 p.m. at the Cambridge library’s O’Neill Branch, 70 Rindge Ave., North Cambridge. Free. Explore the urban outdoors with a discussion of the birds we share our outdoors with and get bird-watching tips, including how to identify an unfamiliar species. Information is here.

“From Cambridge to Yerevan: 35 Years of Friendship” opening reception from 7 to 8:30 p.m. at the Cambridge Main Library, 449 Broadway, Mid-Cambridge. Free, but registration is required. Board members of the Cambridge Yerevan Sister City Association recall the early history of the organization and highlight special projects around an ongoing display of documents, photos, posters and objects connected to its 35th anniversary up through April. Light refreshments will be served. Information is here.

“Weeding Out the Stoned” game show at 8 to 10 p.m. at The Rockwell, 255 Elm St., Davis Square, Somerville. $20 for a 21-plus show. Comedian Alex Grubard brings on contestants to undergo mind games and sobriety tests so the audience can eliminate all but the sole sober person and win prizes.Guests are expected to include Rob Crean, Andrew Mayer, Mary Spadaro, Josh Pick, Trent Wells, Nick Ortolani, Tyler Tuttle, Tyler Durniak and Ann-Marie Keene. BrooklynVegan called it “Endearingly absurd.” Information is here.

Wednesday, April 19

An owl. (Photo: Iain A Wanless via Flickr)

“Owls of the World – Who’s Watching You?” from 2 to 3 p.m. at the Cambridge library’s O’Neill Branch, 70 Rindge Ave., North Cambridge. Free. You get to see six live owls up close while learning about the species with teacher Marcia Wilson and author-photographer Mark Wilson. Information is here.

School vacation week movie: “Early Man” from 2:30 to 4:30 p.m. at the Somerville Public Library, 79 Highland Ave., on Central Hill. Free. A a stop-motion animated comedy by Nick Park (the creator of Wallace and Gromit and Shaun the Sheep) starring the voices of Eddie Redmayne, Tom Hiddleston, Maisie Williams and Timothy Spall. Information is here.

Ulbe Bosma reads from “The World of Sugar: How the Sweet Stuff Transformed Our Politics, Health and Environment over 2,000 Years” at 7 p.m. at Harvard Book Store, 1256 Massachusetts Ave., Harvard Square. Free. The Vrije Universiteit Amsterdam professor explores how sugar became so ubiquitous after humans did without it for most of history. The author will be in conversation with Sharmila Sen of Harvard University Press. Information is here.

Thursday, April 20

4/20 Party from 5 to 9 p.m. at Lamplighter Brewing, 284 Broadway, The Port. Free, but 21-plus. This night could be “every pothead’s dream” with ramen from Kurukury, Honeycomb Creamery ice cream and the brewery’s own Dazed & Confused IPA enjoyed with stoner flick “Pineapple Express” and an iconic episode of “Broad City.” Information is here.

“Mine, Yours, Theirs, Ours? Ownership and Stewardship in the Age of Blockchain” talk from 6 to 7:30 p.m. at Harvard Art Museums, 32 Quincy St., near Harvard Square. Free, but a reservation is recommended. As technology and calls for repatriated art and artifacts change culture, artist Kevin McCoy, fellow NYU educator Amy Whitaker and television producer Ruth Streeter look at art ownership and ask if blockchain technology could be useful in crafting a new, more equitable model. Information is here.

National Poetry Month: Sadie Dupuis presents “Cry Perfume” from 6:30 to 8 p.m. at the Cambridge Main Library, 449 Broadway, Mid-Cambridge. Free. A reading and conversation with Boston Globe writer and DJ Maura Johnston, audience Q&A and book signing. Information is here.

Poets Barbara Carlson, Ewa Chrusciel, Joanna Fuhrman and Yerra Sugarman read at 7 p.m. at the Grolier Poetry Book Shop on 6 Plympton St., Harvard Square. $5. The readers are introduced by John Mulrooney. Proof of vaccination is asked at the door and masks are required. Information is here.

Peter D. Kramer reads from “Death of the Great Man: A Novel” at 7 p.m. at Harvard Book Store, 1256 Massachusetts Ave., Harvard Square. Free. The author of “Listening to Prozac” has switched to fiction, presenting a tale of a psychiatrist forced into hiding when the nation’s narcissistic, autocratic chief executive dies on his consulting-room couch. The author will be in conversation with Globe columnist Alex Beam. Well-fitting masks are required. Information is here.

“Strange and Unexplained with Daisy Eagan” podcast recording at 7 p.m. at Somerville Theatre’s Crystal Ballroom, 55 Davis Square. $32. Too bad the podcaster already did her episode on the “vortex of evil” known as the Bridgewater Triangle; it looks like we’re due to hear about the notorious Alcatraz prison, punctuated by Eagan’s “trademark skepticism and heavy side-eye.” Information is here.

Weird Local Film Festival No. 15 from 7 to 10:30 p.m. at Warehouse XI, 11 Sanborn Court, Union Square, Somerville. There’s a suggested donation of $5 for this 18-plus show. Short works from “filmmakers in reasonable proximity to Somerville” make up this semi-regular screening event, which this time leans into “some cheesy 420 stuff.” Information is here.

“Earth and Air” with pianist Hao Ding at 8 p.m. at the Longy School of Music, 27 Garden St., Harvard Square. Free, with donations of $10 or up welcomed. A graduating student recital of works by Bach, Schubert, Schumann, Rachmaninoff and Elena Kats-Chernin. Information is here.

“Metropolis” radio play from 8 to 10 p.m. at the Guild Church (formerly Boston Brunch Church), 204 Elm St., Davis Square, North Cambridge (and continuing through Saturday). $22.69. An original full-length staged, audio-focused dramatic adaptation by The Post-Meridian Radio Players of the classic silent film. Information is here.

Friday, April 21

A Mandy Roberge henna design. (Photo: Mandy Roberge via Facebook)

Wicked Good Henna from 2 to 4 p.m. at Cambridge library’s Boudreau Branch, 245 Concord Ave., Observatory Hill in Neighborhood 9. Free. Mandy Roberge designs unique henna art for all registrants. Information is here.

Somerville Open Studios first-look exhibit from 2 to 5 p.m,. at the Somerville Museum, 1 Westwood Road, in the Spring Hill neighborhood (and continuing Saturday). Free. See artists’ work and plan visits for the next weekend’s actual Open Studios around the city. Information is here.

Custom Commission Showcase Concert at 3 p.m. at the Longy School of Music, 27 Garden St., Harvard Square. Free, with donations of $10 or up welcomed. World premieres of works by Jiashu He, Innocent Okechukwu, Qudrat Wasefi and Chuyue Xu. Information is here.

Bread & Puppet Theater’s “Inflammatory Earthling Rant (With Help From Kropotkin)” from 8 to 9 p.m. at Cambridge Common, near Harvard Square. $20. Vermont’s rabble-rousing troupe returns to wield cardboard and papier-mâché puppets painted in Peter Schumann’s exuberant, slapdash expressionist style with satirical, slapstick comedy, singing and a live band. Afterward comes the sharing of famous sourdough rye bread with aioli and sale of “Cheap Art” – books, posters, postcards, pamphlets and banners from the Bread & Puppet Press. Information is here.

“Metropolis” radio play (continued) from 8 to 10 p.m. at the Guild Church (formerly Boston Brunch Church), 204 Elm St., Davis Square, North Cambridge (and continuing through Saturday). $22.69. Information is here.

Rock & Roll Rumble semifinals from 9 p.m. to midnight at The Middle East Upstairs, 472 Massachusetts Ave., Central Square. $20 and 18-plus. Anngelle Wood’s Boston Emissions Rumble institution, begun in 1979, heads into its third week with a faceoff between Bird Language and other bands. Information is here.

“Angels & Demons” party at 9:45 p.m. at the Massasoit Elks Lodge, 55 Bishop Allen Drive, Central Square. $35. Come dressed – at the very least in all-white or all-black, and pick up bracelets indicating whether you’re single, taken or open. Then dance to deep house, EBM, techno, dark synth and witch house. Information is here.

Saturday, April 22

Somerville Open Studios first-look exhibit (continued) from noon to 5 p.m,. at the Somerville Museum, 1 Westwood Road, in the Spring Hill neighborhood. Free. Information is here.

Celebration of National Poetry Month from 2 to 4 p.m. at the the Cambridge Main Library, 449 Broadway, Mid-Cambridge. Free, with registration encouraged. A reading by acclaimed poets Toni Bee, Eileen Cleary, Deborah Leipziger, Michael McInnis and Lloyd Schwartz. Information is here.

“Metropolis” radio play (continued) from 2 to 4 p.m. and 8 to 10 p.m. at the Guild Church (formerly Boston Brunch Church), 204 Elm St., Davis Square, North Cambridge (and continuing through Saturday). $22.69. Information is here.

Alfred Russel Wallace circa 1895.

Alfred Russel Wallace lightning talks and birthday drinks from 5:30 to 7:30 p.m. at the Harvard Museum of Natural History, 26 Oxford St., in the Baldwin neighborhood near Harvard Square. $20. As Tesla is to Edison, Wallace is to Darwin – a guy who discovered the theory of evolution by natural selection independently but lacked Darwin’s privilege and wealth. Get a download on the guy in a fun atmosphere, including with a Wallace-themed mocktail or cocktail. Information is here.

Esh Circus Arts student showcase from 7:30 to 9:30 p.m. at The Center for Arts at the Armory, 191 Highland Ave., Somerville. $24.10. Aerial stunts, group acrobatics, athletic dancing and clowning in a showcase of student talent. Masks are required for those 2 and older. Information is here.

De Falla’s “El Amor Brujo” and Piazzola’s “Maria de Buenos Aires” at 8 p.m. at the Longy School of Music, 27 Garden St., Harvard Square (and repeating Sunday). Free, with registration required and donations of $10 or up welcomed. De Falla’s fiery ballet suite and Piazzolla’s surrealist tango opera examine how the most vulnerable women in society face and deal with adversity. This production features student singers and Orchestra Flex as directed by Christopher Sierra and conducted by Ryan Turner. Information is here.

“Magic” choir concert at 8 p.m. at St. Peter’s Episcopal Church, 838 Massachusetts Ave., Riverside near Central Square. $25. “Ritual, spells and otherworldly sounds, revealing that music is magic. Exploring the supernatural, its personal relevance, its radiant effectiveness and the reunification of the self and the universe” from the Nightingale Vocal Ensemble. Information is here.

Salsa & Bachata Masquerade Ball at 9 p.m. at Dante Alighieri Society Center, 41 Hampshire St., Kendall Square. $20 and 21-plus. A second annual night of elegant dancing, music, “mystery and enchanting company.” Information is here.

Rock & Roll Rumble semifinals from 9 p.m. to midnight at The Middle East Upstairs, 472 Massachusetts Ave., Central Square. $20 and 18-plus. Anngelle Wood’s Boston Emissions Rumble institution, begun in 1979, holds a faceoff between Kooked Out, One Fall, Not Bad Not Well and a wildcard. Information is here.

The Kerfuffle! variety show from 9:30 to 11 p.m. at The Rockwell, 255 Elm St., Davis Square, Somerville. $20. A blind-booked vaudeville variety show with a mix of sketch, interactive and completely undefinable comedy. Information is here.

Sunday, April 23

Cambridge’s Fresh Pond on Tuesday. (Photo: Marc Levy)

Earth Week Fresh Pond cleanup from 11 a.m. to 1 p.m. starting at 250 Fresh Pond Parkway, in West Cambridge at Fresh Pond. Gloves and bags will be provided as a ranger-led walk cleans land important not just to wildlife, but to our drinking water supply. Information is here.

Plant Parent Swap and Shop from 11 a.m. to 5 p.m. at The Center for Arts at the Armory, 191 Highland Ave., Somerville. Free. There’s an anonymous plant swap table, vendors and raffle baskets. Information is here.

Hassle Flea from 12:30 to 6:30 p.m. at the Cambridge Community Center, 5 Callender St., Riverside. Admission is $1. A flea market featuring handmade artwork, prints, patches, records, tees, pins, ceramics, jewelry, zines, body care, tea, fiber art, vintage clothing, accessories, books as well as tarot readings, haircuts and live drawings. Masks are requested. Information is here.

De Falla’s “El Amor Brujo” and Piazzola’s “Maria de Buenos Aires” (continued) at 3 p.m. at the Longy School of Music, 27 Garden St., Harvard Square. Free, with registration required and donations of $10 or up welcomed. Information is here.