Aggregation No. 1The Boston Festival of Indie Games from 10 a.m. to 8 p.m. Saturday at the Massachusetts Institute of Technology’s Building W34, also known as the Johnson Athletics Center, 120 Vassar St., in the MIT/Area II neighborhood. Tickets are $12 with a $1.29 online service fee per person.

Love game? Bored with the ones you have? Come look at the ones you might not be able to get yet – or ever. This fourth annual family-friendly event encourages attendees to share and interact with various kinds of games, including video and tabletop, as well as to attend talks, panels and workshops on indie game development and the future of the game industry. “The games featured at the annual festival are innovative and refreshing, demonstrating both the budding and the established talent of game makers in the American Northeast,” organizers of the nonprofit event say. The annual Figgies Awards Show ends the day. Information is here.

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Aggregation No. 2Riverfest from noon to 8 p.m. Saturday at Assembly Row and and the Sylvester Baxter Riverfront Park, 300 Grand Union Blvd., Somerville. Free.

In addition to daylong live music, interactive sidewalk art, food, children’s activities (including free games, face painting, balloon artists, magicians and other performers) and an 8 p.m. fireworks show over the Mystic River, this eighth annual Riverfest marks the final installment of Assembled: The Handmade Arts Market at Assembly Row, which brings together dozens of local makers of arts and crafts. Information is here.

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Aggregation No. 3The Evolution of Hip-Hop from 3 to 7 p.m. Saturday on Union Square Plaza. Free.

This family-friendly showcase of the history of hip-hop and exploration of what it brings to communities includes musical performances by local talent, spoken-word performances, bboy/bgirl battles, a Frederick Douglass reading, vendors and hands-on activities such as a multimedia booth sponsored by Somerville Community Access Television where visitors can express themselves. Information is here.

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Aggregation No. 4Somerville Rock and Roll Yard Sale from 11 a.m. to 5 p.m. Sunday on Union Square Plaza, 90 Union Square, Somerville. Free.

Chris and Jennifer Daltry of What Cheer? Records in Providence, R.I., have been putting on their Rock And Roll Yard Sales for about a decade in their home state and as part of the Somerville Arts Council’s ArtsUnion program. These events feature local independent sellers offering up a quirky and unique mix of primarily vinyl records and music-related stuff as well as vintage goods and DIY handmade items. Some of New England’s best record sellers will be on hand with piles and crates of vinyl to dig through, including LPs, 45s, 78s and CDs, cassettes, eight-tracks, music and audio gear and other music memorabilia, making for a perfect way to find one-of-a-kind items and support DIY and independent, small businesses. The event includes live music from Hot Molasses, Dan Blakeslee and the Calabash Club and Benjamin Cartel, and local celebrity DJs will spin vinyl. Information is here.

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Aggregation No. 5Cambridge Carnival from 12:30 to 6:30 p.m. Sunday in Kendall Square. Free.

The 23rd Annual Cambridge Carnival International Festival and Parade arrives in its usual spectacular fashion. The Caribbean/African-themed carnival starts with a 12:30 to 4 p.m. parade of dazzling handmade costumes accompanied by steel bands and percussion groups and settles into Kendall Square with DJs and bands playing world music, Haitian roots, reggae and Soca. A variety of savory foods will be for sale, and there’s plenty for kids to do, including stilt-walking demos, story-telling, face-painting, balloon art and arts and crafts activities – most free. The carnival has drawn crowds of up to 100,000 people.

The parade begins at Putnam Avenue and River Street, continues up River Street, turns right on Massachusetts Avenue, passes the Central Square T stop and makes a left on Main Street, ending at a viewing stand on Main and Albany streets in Kendall Square. Information is here.