051216i-CRLS-DanceWorks

Aggregation No. 1CRLS Dance/Works from 7 to 9 p.m. Friday and Saturday at Cambridge Rindge and Latin School’s Fitzgerald Auditorium, 459 Broadway, Mid-Cambridge. Tickets are $10 for adults, or $5 for students and seniors.

The high school’s amazing, near-pro dance program has new works to present, created by alums Junior Cius, Alessandra Gazzola and Brandon McCrory-Joseph as well as teacher Brenda Divelbliss, guest artist Marya Wegman and student choreographers. Information is here.

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Aggregation No. 2Seventh Annual Film Shift Film Festival from noon to 11:30 p.m. Saturday at Aeronaut Brewing, 14 Tyler St., near Union Square, Somerville. Free, but registration is suggested, as the event is expected to fill up fast.

For some reason, Jed Hammel is driven to Herculean lengths to produce free entertainment, and this one (put together with the Startup Institute and Aeronaut) is another doozy: independent films will be screened, two DJs and singer-songwriter Julia Mark will provide music,  giant games of “telephone” will be attempted and there will be projected art, a photo booth and a swag bag. Information is here.

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051216i-Cambridge-Open-Studios

Aggregation No. 3Eighth Annual Citywide Cambridge Arts Open Studios from noon to 6 p.m. Saturday and Sunday at various locations around the city. Free.

There are more than 100 artists of all kinds opening their studios to show their work and workspace in this eighth annual citywide event, as well as to present music, poetry and readings. Short on time or uninterested in lots of bus travel or walking? Not only did the Cambridge Bicycle Committee put together cycling routes connecting open studio locations; there are a bunch of common venues, such as The Ice Cream Factory Lofts at 93 Harvey St., near Alewife, with nature photography, wood sculpture and painting, and clusters of open studios such as between Alewife and Porter Square and in the blocks just south of Central Square. The event has a free app for mobile devices available here from Cambridge-based Yonward, and a full printable brochure is here. Even more information is here.

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051216i-Tiny-Tall-Ships-Festival

Aggregation No. 4Tiny Tall Ships Festival from 3 to 6 p.m. Saturday at Union Square Plaza, 90 Union Square, Somerville. Free.

The festival is a bite-sized, all-ages celebration of all things nautical, with a whimsical centerpiece in a series of kiddie pools set up across Union Square and stocked with small ships, sea monsters and other floating sculptures. Participants can make their own tiny boats to race in temporary lagoons made by Somerville artist Hilary Scott, and there will be other a slew of other events: a tattoo contest (permanent or temporary), stories for children, sandcastle building, a pirate-themed obstacle course, seafood, crafts, and songs. Costumes are encouraged, with pirates and mermaids promised to be on hand (if not on land). The festival even ships in a celebrity in Harvard sociologist Matt Kaliner, who has been building uniquely sophisticated, gravity-defying sand sculptures for a decade (even making it into Architectural Digest) and on Saturday will show how he does it. Information is here.

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051216i-OnStage-Arts-Marathon

Aggregation No. 5Third Annual OnStage Arts Marathon from 6 to 11 p.m. Saturday at the OnStage Dance Co., 276 Broadway, in the Winter Hill neighborhood of Somerville. General admission is $10.

This nonprofit brings together dancers, acoustic musicians and standup and improv comedians from Cambridge, Somerville and the Boston area to perform, celebrate and promote their talents in an 18-plus show with food, drink and raffle prizes. There’s entry throughout the night to enjoy the work of the Cambridge Dance Co.; CONcept ARTists; Dellaluna Dance; Dylan Duncan; Evolve Dynamicz; Kathryn Hallberg; Heather Brown Dance; Ben Higginbotham; Iconic Movement; Improv Jones Boston; Kinetic Synergy Dance Co.; Kindra Lansburg; Nazar Bollywood Dance Troupe; OnStage Dance Co.; the OnStage Repertory; Ryan Sweezey; David Thomas; Total Feltdown; Dylan Uscher; Christa Weiss; and Anne Whitehead and Dancers. Information is here.

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Aggregation No. 6The 33rd Annual Mayfair from noon to 6 p.m. Sunday in Harvard Square. Free.

Here’s a bonus event, delayed from May 1 by bad weather: A spring tradition that features four stages of music; more than 30 dance troupes; more than 40 food vendors serving international fare and local favorites; more than 120 artisans and merchants selling arts and crafts, jewelry and vintage clothing; a Church Street chalk art event that raises money for local charities; Cambridge Historical Tours and and “Stump the Historian” game at the history booth; and games and entertainment for all ages, including an all-ages Roaming Railroad train ride and children’s activity area, aerobic bootcamps and four beer gardens. No wonder the event draws more than 100,000 people. Information and a complete schedule of music and other events is here.