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Aggregation No. 1Rangoli sand art exhibit from 7 to 9 p.m. Friday. Free.

Mumbai-based Rangoli portraiture artist Suhas Kavthekar is in town for workshops and master classes to share his 20-plus years of experience with making “paintings” of sand. During this two-hour exhibition and demonstration he’ll show how to do Rangoli, take questions and – at the end – wipe away his colorful sand art forever. Information is here.

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Aggregation No. 2Kids take the stage Friday, Saturday and Sunday in Cambridge and Somerville:

The OpenAir Circus at 7 p.m. Friday, at 2 and 7 p.m. Saturday, and at 2 p.m. Sunday at Nunziato Field, at Vinal Avenue and Summer Street, near Union Square in Somerville. There is a suggested donation of $3 per person.

The OpenAir Circus, a nonprofit, community-based program, is ready for its annual showing off of skills its students learned during summer classes. This 31st annual show features children and adult performers in a two-hour circus extravaganza with one 15-minute intermission, and refreshments, souvenirs and circus equipment available for sale. Information is here.

Beyond the 4th Wall Expression Theater’s Little Shop of Horrors” at 7 p.m. Friday, Saturday and Sunday at The Kennedy-Longfellow School, 158 Spring St., East Cambridge. Tickets at the door are $18 for adults, $12 for kids. http://beyondthe4thwall.com/

This 1980s rock-Motown comic-horror musical ran for five years in New York, staging the 1960 horror-comedy film by Roger Corman that tells the story of hapless store clerk Seymour, his love for Audrey and his cultivation of Audrey II, a plant that feeds on human blood … and keeps getting hungry. The show will be performed by Beyond the 4th Wall’s 20-teen troupe of 14- to 18-year-olds. Information is here.

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Aggregation No. 3Fresh Pond Monarch Butterfly Release Parade from 2 to 3:30 p.m. Saturday (the rain date is Sunday) at the Water Department Treatment Facility at 250 Fresh Pond Parkway, in West Cambridge at Fresh Pond.

The city’s Fresh Pond Monarch Watch program has been raising monarch butterflies to help stem the species’ worldwide decline. With the monarch caterpillars now butterflies, this family-friendly parade is planned to release them and wish them luck on their migration to Mexico. A parade (costumes and noisemakers welcome) will take participants from the water treatment facility to Lusitania Meadow, where we’ll send the butterflies off into the flowers and onward. Information is here.

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Aggregation No. 4“What Is Punk?” story time and singalong from 11 a.m. to 1 p.m. Saturday at Porter Square Books, 25 White St., Porter Square. Free.

Raising a little punk? Eric Morse, founding editor of Trampoline House magazine, wrote “What Is Punk?” in rhyming couplets to educate young ones on the progressive, idealistic history of the musical genre, and he got Anny Yi to illustrate it in colorful clay (“Think ‘Wallace and Grommet’ with liberty spikes and anarchy patches,” San Diego City Beat said). This reading continues the magic with a kiddie-punk sing-along that just has to be seen. Information is here.

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Aggregation No. 5Harvard Summer Chamber Orchestra’s “Fairytales and Simple Gifts”: An Afternoon of Mozart, Copland and Sibelius at 3 p.m. Sunday in Harvard University’s Paine Hall, 3 Oxford St., just north of Harvard Square and Harvard Yard. Free, with donations accepted here.

This new ensemble – begun in May by by Nick Sterner, Andrew Heath and Elias Miller and made up of area musicians that include high school, university and conservatory students, graduates, professionals and high-level amateurs – celebrates its first season by performing the overture from Mozart’s “Magic Flute,” Sibelius’ “King Christian II Suite” and Copland’s “Appalachian Spring,” conducted by Miller. Information is here.