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Aggregation No. 1Chamber music concert at 3 p.m. Saturday at the New School of Music, 25 Lowell St., West Cambridge. Free.

The pieces to be played at this free concert are a mystery, but the talent is solid: Pianist Ai-Ying Chiu has been soloist and chamber pianist at halls across North America, China and Asia; violinist Sonia Deng plays around New England and the world, including stints under Pierre Boulez in Switzerland and Lorin Maazel at the Castleton Music Festival in Virginia; and cellist Kett-Chuan Lee was was the youngest member of the National Symphony Orchestra and Radio Television Orchestra in Malaysia before coming to the United States. Information (scant though it is) is here.

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Aggregation No. 2“The Grand Budapest Hotel” at 8 p.m. Saturday at the Massachusetts Institute of Technology’s Building 26-100, also known as the Compton Laboratories, at 60 Vassar St. Free.

Wes Anderson’s latest confection is a tale within a tale about friendship, love and murder at a famous European hotel between the first and second world wars. It got an 88 on Metacritic (and an 8.2 user score) and a 92 percent fresh score from Rotten Tomatoes (and an 86 percent from the audience). (And read Tom Meek’s review here.) The screening is a gift from the MIT Lecture Series Committee.

Since you haven’t spent any money seeing “Grand Budapest,” shoot over to Harvard Square to catch a double-feature by seeing “Eraserhead” at a properly dark and late 11:30 p.m. Saturday at The Brattle Theatre, 40 Brattle St. This nightmare on film by David Lynch follows a guy with interesting hair whose girlfriend gives birth to their horribly mutated, eternally yowling baby. Tickets are $10 general admission, $8 for students and members and $7 for seniors and young children.

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Aggregation No. 3Art Walk in the Park from 11 a.m. to 5 p.m. Sunday at University Park Commons, near Central Square. Free.

The Art City organization continues its solid month of events, switching from music, film and dance to focusing this weekend on … art. This day has a lot going on, including chances to browse artists’ work, get your picture taken with sculptures crafted by the Individuals Collective, draw alongside the pros (bring your sketchbook), create an original comic and storyboard and participate in community projects including Brian Butler’s Ice Cream People, sidewalk chalk art and a kids’ coloring table. There will also be food vendors and an acoustic performance by The Dazies, a side project by M. Holland of Mean Creek.

More than 50 artists and collective are involved in the Art Walk, and there’s a free Emerging Artist Showcase continues through Aug. 29 at the Cambridge Arts Council, on the second floor of 344 Broadway. It’s open Mondays from 8:30 a.m. to 8 p.m., Tuesdays through Thursdays from 8:30 a.m. to 5 p.m. and Fridays from 8:30 a.m. to noon.

Information is here.

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Aggregation No. 4Gustafer Yellowgold from 4:30 to 5:30 p.m. Sunday at Regattabar, 1 Bennett St., Harvard Square. Tickets are $12 (or $13.50 with service charge).

Gustafer Yellowgold is an international kids’ phenomenon described by The New York Times as “a cross between ‘Yellow Submarine’ and Dr. Seuss,” and Entertainment Weekly called the show – performed by Morgan Taylor since 2005, including as an opening act for Wilco and The Polyphonic Spree – as “absurdly appealing” for adults and kids. Expect a multimedia performance of live music, animated illustrations and storytelling. Information is here.

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Aggregation No. 5Admiral Kittypants’ new reading of “A Streetcar Named Desire” at 2 p.m. Sunday at The Democracy Center, 45 Mount Auburn St., Harvard Square. Suggested $5 donation.

The Tennessee Williams play gets a partial, gender-flux reading at this monthly showcase of theater-before-it’s-theater attended by area creatives looking for peer feedback and open-minded audiences. Get a peek at what’s coming in a New England Theatre Geek-sponsored “creative community experiment that promises performers of all stripes and polka dots the opportunity to play with their art in a relaxed, safe space before performing it on the stage.” Information is here.