Somerville's OPENAIR Circus, which teaches circus skills to children, teens and adults, is holding its big-top performance this weekend. Under a tent at Nunziato Field near Union Square, you'll be able to see kids juggling, walking on stilts, performing acrobatics and more. There are performances Friday (7 p.m.), Saturday (2 p.m. and 7 p.m.) and Sunday (2 p.m.). Here's some more information. See our video of last year's circus here.
Glovebox Short Film and Animation Festival
Film artists and animators will show off work at the annual Glovebox Short Film and Animation Festival. It takes place Saturday starting at 2 p.m. at Somerville Theatre.
Fourth Annual Metro Mayors Basketball Tournament on Saturday
The Metropolitan Area Planning Council sent the following about the basketball tournament, taking place in Somerville on Saturday: "Law enforcement officials, youth services workers and local teens will join together for the Fourth Annual Metro Mayors Basketball Tournament … in a show of solidarity among youth and those who fight for their safety. Cambridge, Chelsea, Everett, Malden, Quincy, Revere, Somerville and Winthrop will send teams to a five-on-five tournament hosted by the Metro Mayors Coalition as a way to promote safe summer activities and kick off the coming school year."
Canoe for a cause on the Mystic River
Spend some time canoeing on the Mystic River while removing water chestnuts, an invasive species. Canoeing begins at 9 a.m. Saturday at 32 Shore Drive. Canoes are provided, but you can also bring your own boat. Register here.
Learn to grow mushrooms
Ever wanted to grow your own mushrooms? Learn how with the Somerville Community Growing Center as part of its Urban Agriculture Skill-Building series. The mushroom lesson begins at 10 a.m.
Free museums: MFA, Harvard Museum of Natural History
As part of the "Museums on Us" program, Bank of America cardholders can get into the Museum of Fine Arts, the Harvard Museum of Natural History and some other museums in Massachusetts on Saturday and Sunday. Learn more here.