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Looking for some basic computer or mobile device guidance? Want help using an online resource? Drop in tech help at Valente can assist you with signing up for low-cost home internet, setting up your computer or mobile device, making an email account, navigating websites or databases, and other basic technology assistance. If you would like assistance with a device, please bring the device, all cords, and any account information. Library staff cannot be held responsible for damage to patron-owned equipment. If you have questions, please send them to: kmcquown@cambridgema.gov

Cambridge map of the quickest and safest routes to each public school

There was a great turnout by kids of all ages

Applying for building,electrical,gas and plumbing permits

Sending humans to Mars is hard. Bringing them back safely is even harder. Doing so while also having them perform cutting-edge science and exploration during the mission? A major challenge. Luckily, we can plan and test parts of our future Mars missions before we leave the ground. In this session, we discuss the design and completion of two analog (Earth-based, Mars simulation) missions: Project MADMEN and Pale Red Dot. Come experience life on Mars as we traverse rocky terrain for geology and astrobiology experiments, test different cooking methods to make Martian meals, and navigate emergencies in space. Ever wanted to be an astronaut? This is your chance to experience life on “Mars”!

History Cambridge, the Somerville Museum, Longfellow House-Washington's Headquarters National Historic Site, Friends of Longfellow House-Washington’s HQ, Boston 1775, Cambridge Historical Commission, and Cambridge Public Library will present free events marking the 250th anniversary of the 1774 Powder Alarm and the start of Massachusetts’s political independence from Britain.

The City of Cambridge’s Shade Is Social Justice program will provide cooling and use the power of design to prompt imagination, community-building, and action to help the community adapt to global warming.

Expect traffic impacts due to event-related road closures between Wednesday, April 17, and Sunday, April 21.

Harvard Book Store and the Cambridge Public Library welcome Ben Wikler—political organizer and strategist who served as the chair of the Democratic Party of Wisconsin from July 2019 to July 2025—for a discussion of his new book, This Is The Plan: How to End America's Meltdown and Save Democracy. He will be joined in conversation by Danielle Allen—James Bryant Conant University Professor at Harvard University, acclaimed author of Our Declaration, and the forthcoming book Radical Duke, releasing June 2026. Registration is required.

The City of Cambridge wants to make sure everyone—residents, families, pet owners, and businesses—stays safe, cool, and prepared during extreme heat. Here is a guide to locate places to cool off this heat wave and summer!