JuggleMIT from 5 p.m. Friday to 1 a.m. Saturday; 9 a.m. Saturday to 1 a.m. Sunday; and 9 a.m. to 4 p.m. Sunday at the Massachusetts Institute of Technology’s Building 50, also known as the Walker Memorial, 142 Memorial Drive. A general admission full festival pass is $30; cheaper day passes can be bought at the door.

The fourth annual JuggleMIT kicks off Friday with open juggling, introductory classes and a stage show; a full-day workshop and activity schedule on Saturday culminates in the JuggleMIT Circus Show, featuring 10 world-renowned jugglers and circus performers; and Sunday features more workshops, MIT-themed juggling games and prizes.Performers over the weekend include The Red Trouser Show, Cate Great, Jonah Greenhouse, Paris the Hip-Hop Juggler (above), Alex the Jester, Chloe Walier, Joe Showers, Matan Presberg, and Susan Voyticky. (Seeing just the JuggleMIT Circus Show, 7 to 9 p.m. Saturday at the Kresge Auditorium, 48 Massachusetts Ave., is $15 general admission.) Information is here.

The Boston Festival of Indie Games from 9 a.m. to 7:30 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 $15 (with a $1.37 service fee when bought in advance).

Love games? Bored with the ones you have? Come look at the ones you might not be able to get yet – or ever. This sixth annual family-friendly event encourages attendees to share and interact with various kinds of games, including video and tabletop, as well as drop in to try some “Boffer” combat with foam and latex weapons and see Quidditch exhibition games all day long, with a session at 11 a.m. specifically for those ages 7 to 12). The Figgies Awards Show ends the day starting at 6:15 p.m. Information is here.

What the Fluff? Marshmallow Festival from 3 to 7 p.m. Saturday (rain date is Sunday) in Union Square Plaza, 90 Union Square, Somerville. Free.

Delicious and horrible Marshmallow Fluff was invented in Somerville in 1917, when a local named Archibald Query made it in his kitchen and sold it door to door; that makes the city’s 12th annual Fluff Festival also the 100th anniversary of the stuff. The festival honors the concoction in most every way imaginable, drawing more than 12,000 people to a day of music, games such as the Fluff Lick-Off and Blind Man’s Fluff and, of course, lots of Fluff-related foods. (The classic Fluffernutter is just the start.) There are 18 providers of Fluff-based sweets and nine providing savory foods. Information is here.

Pop-up Concert with Mary Bichner from 1 to 1:30 p.m. Sunday at Mount Auburn Cemetery, 580 Mt Auburn St., West Cambridge. (The concert location is a 10- to 15-minute walk from the cemetery’s main gates, so arrive by 12:45 p.m. There is a rain location inside the cemetery.) Free.

Join composer Mary Bichner and the Planetary Quartet for a special 20-minute pop-up concert in the cemetery’s gorgeous Consecration Dell – part of Bichner’s two-year unique residency. (Her 12-track “Spring & Autumn Suites” are available as free downloads.) Bichner sings, Sonia Deng is on viola, Cherry Kim is on cello and Elizabeth Stefan and Foxman McCarthy-James play viola. The concert provides the perfect chance to afterward wander and appreciate the 72-acre cemetery, set aside in 1831 for the city’s dead and now hosting poets, cooks and Supreme Court justices. Information is here.

Dumpling Festival at The Central Flea from 11 a.m. to 5 p.m. Sunday in the parking lot at 95 Prospect St., Central Square. Free.

In addition to the vintage and antique vendors, artists and designers, import and fair trade vendors, specialty food vendors, live music, graffiti art and community nonprofits at this market – held the last Sunday of the month through October – some 15 local restaurants and food trucks will cook various kinds of dumplings in honor of Cambridge’s Joyce Chen, credited with popularizing northern-style Chinese cuisine in the United States; coining the name “Peking Raviolis” for potstickers; inventing and holding the patent to the flat-bottom wok with handles, also known as the stir-fry pan; and developing the first line of bottled Chinese stir-fry sauces for the U.S. market. Participating restaurants and trucks include Bao Nation; Dumpling House; Dumpling Palace; Gourmet Dumpling House; H-Mart; Happy Lamb Hot Pot; Hong Kong Restaurant; Mei Mei; the Moyzilla Food Truck; Patty Chen’s Dumpling Room; Quingdao Garden; Royal East; the Sate Grill Food Truck; Shanghai Fresh; Thelonious Monkfish; Tom’s Bao Bao; and Zuzu. Information is here.