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Aggregation No. 1The Festival of You & Us & We & Them at 8 p.m. Friday and Saturday and 11:30 a.m. and 7 p.m. Sunday at The Dance Complex, 536 Massachusetts Ave., Central Square. Tickets range from $12 general admission for individual events (or $13.41 with the online service fee) to $70 for a festival pass good for the entire weekend (or $73.44 with the fee).

This three-day event includes Friday’s M’Bolo Afro-Fusion Concert; Saturday’s “Dances for You & Us & We & Them” with the Kairos Dance Theatre (pictured above), Brian Feigenbaum, DSundanceX, Crabtree Carabetta Collective, Yosi Karahashi flamenco and Anjali Nath of Chhandika; Sunday’s “Continental Breakfast/Continental Dances,” with breakfast and special I’ve-Got-a Complex-Mimosas available during performances by Soumaya Maghouz, Manny Fernandez and Rebecca McGowan; and more “Dances for You & Us & We & Them” with Jenny Oliver and Modern Connections, DanceVisions and Brian Feigenbaum. In addition, Allison Orr of Forklift Danceworks in Austin, Texas, will discuss “Trash Dance,” her choreography with a sanitation crew and garbage trucks performed on an airplane tarmac; and there will be informal showings of The Dance Complex’s aMaSSiT Creative Lab; and other things announced by the day. Information is here.

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Aggregation No. 2Brickbottom Open Studios from noon to 6 p.m. Saturday and Sunday at Brickbottom Artists Buildings, 1 Fitchburg St., Somerville. Free.

More than 60 artists open their live-work studios to the public, showing and selling work at every price range in this 28th annual event, and there are another 50-plus artists taking part in the event at the nearby Joy Street Studios. There will be demonstrations, pop-up performances, installations in the stairwells and courtyard, video screenings in the hallways, custom programming on the radio and “Mood Elevators” – as well as the fourth annual Reciprocity Stream open photo show, in which visitors are invited to take a photo home for free as long as they leave a photo of their own in its place. The Biscuit will serve pastry and coffee bar in the lobby. Information is here.

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Aggregation No. 3Brazilian Street Food Pop-Up from noon to 3 p.m. Saturday at Union Kitchen, 121 Washington St., Somerville. Tickets are $7.

Culinary entrepreneur Robson Lemos and the Somerville Arts Council offer an inaugural pop-up lunch at Union Kitchen with Brazilian street food such as Bolinho de Bacalau fish cake; Empadinha de Frango chicken pies; and Kibe, a Middle Eastern snack that reflects Brazil’s large Lebanese population – all served with a traditional salad made with kale and black-eyed peas. (This event is near the Brickbottom and Joy Street open studios.) Information is here.

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Aggregation No. 4Studio 263: Art Auction/Dance Party from 7 to 10 p.m. Saturday at Gallery 263, 263 Pearl St., Cambridgeport. Tickets are $30 in advance ($31.74 with the online service fee) or $35 at the door.

Gallery 263 will be imbued with the spirit of the classic New York City nightclub Studio 54 – think velvet rope, glitter ball and 1970s-era attire – at this fundraiser. The disco dance party starts at 9 p.m. Before that comes a Silent Art Auction (with works donated by artist members and past exhibitors), chance to win raffle prizes such as a six-month subscription to ArtSnacks, a curated box of art supplies delivered to your door, and restaurant bundle raffle, including gift certificates from Shepard, Vee Vee, Kirkland Tap & Trotter and Sofra Bakery. Appetizers and cocktails are included with the price of admission. Information is here.

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Aggregation No. 5Cocktail Wars at 6 p.m. Sunday at The Sinclair, 52 Church St., Harvard Square. Tickets are $1.

Four local bartenders go head-to-head in this “Iron Chef”-style mixology challenge, with competitors for this year’s event including Jared Sadoian of The Hawthorne; Peter Szigeti of Committee; Tenzin Samdo of Trade; and Daren Swisher of Hojoko. The evening includes drinks, food and a live set from Bearstronaut and DJ Ryan Brown. All proceeds go to Lovin’ Spoonfuls, an organization for rescuing and distributing fresh food that would otherwise be discarded. Information is here.