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In honor of Earth Day, spend your afternoon at the Library creating your own terrarium. In partnership with Emerald City Plant Shop, you will have the opportunity to learn more about different kind of plants and plant care. This event will be conducted in the front park area of the Library. In the case of rain, the class will be moved to the community room. The Library will provide needed supplies. There will be 2 timed sessions. Please make sure to choose the time that works best for you.

Join us in Joan Lorentz Park (outside the Main Library) for a Summer Kickoff Party for all ages! Enjoy a live concert with award-winning, GRAMMY nominated folk musician Alastair Moock and friends! Take home a tiny blossom kit and enjoy ice-cream (while supplies last). You can also register for Summer Reading, pick up a bingo board and learn more about special events happening across branches all summer long. The Department of Public Works Recycling/Composting, Community Gardens, and Office of Sustainability departments will join us to celebrate summer and the natural world.

Join Earthwise Aware for a fascinating walk as we explore how land use and climate change shape the future of urban green spaces. The loss of biodiversity and the impacts of climate change are pressing challenges, but small actions can lead to big change. Discover how you can make a difference by helping to protect urban ecosystems. Learn to observe and document the incredible interactions between plants, animals, and their habitats while contributing to EwA’s community-driven ecology science projects. Together, we can create a brighter future for urban nature! Meet in Joan Lorentz Park. Registration required.

Join Revolution 250, Boston Celebrations, Hobby Knolls Stables & the Henry Knox Artillery as wells as citizens of the towns of Weston, Waltham, Watertown, and Cambridge for a commemoration of the 250th Anniversary of the epic 1776 adventure of Henry Knox and his "Noble Train of Artillery" trekking across Massachusetts on their way to Boston. The commemoration at 2:00 p.m. follows a procession from the Cambridge Common at 1:00 p.m. that will travel to Joan Lorentz park led by the Sudbury Ancient Fyfe & Drum Corps and finishing with teams of Clydesdales pulling replica sleds and cannons which began their journey in upstate New York.

Seven projects in total were selected after a record number of ideas were submitted and more than 10,000 Cambridge residents age 12 and older voted how to spend $1 million on capital and operating projects to improve the community. In order of ranked votes, the following seven projects won $1,060,000 in fiscal year 2026 funding: 1. Improve Parks with Shade Structures and Seating ($250,000) 2. Build a Pollinator Garden in a City Park ($75,000) 3. Funding for High School Clubs ($150,000) 4. Slower Speeds for Safer Streets ($250,000) 5. Mobile Center for Hard-to-Recycle Items ($75,000) 6. Welcome Baby Boxes for New Parents ($60,000) 7. Electric Vehicle Chargers ($200,000)

Homeowners Rehab Inc. (HRI) renovated 35 Harvey Street, an existing affordable housing development located just off of Massachusetts Avenue near Alewife Linear Park and the Minuteman multi-use path. The work involved converting 16 single-room-occupancy (SRO) units with shared facilities into 12 enhanced SRO housing units with private baths and kitchens. Ten out of the twelve units are deeply affordable by serving households under 30% AMI while the remaining two serve households under 50% AMI. All units have project-based vouchers. Other work includes improvements to the exterior, the addition of a site manager’s office, common area upgrades, and an updated resident meeting space. The project was being designed to meet Enterprise Green Communities (EGC) certification.

Join us for a relaxing walk of Fresh Pond with Park Ranger Tim Puopolo! No two weeks are the same in nature, and Tim will share his insights about what's growing, changing, and blooming in the neighborhood. This walk is not on a paved path. We will walk on uneven terrain, down hills, and over roots. The meeting location for this walk will be in front of the Fresh Pond Ranger Station at 250 Fresh Pond Parkway (under the clock tower). Registration is required. This event can only accommodate a certain number of participants. One registration is good for one person. If you do not register, you cannot participate. Those on the waitlist will be contacted if a space becomes available.

Join us for a relaxing walk of Fresh Pond with Park Ranger Tim Puopolo! No two weeks are the same in nature, and Tim will share his insights about what's growing, changing, and blooming in the neighborhood. This walk is not on a paved path. We will walk on uneven terrain, down hills, and over roots. The meeting location for this walk will be in the courtyard of the Collins Branch Library at 64 Aberdeen Ave. We will walk to Fresh Pond together from there. Registration is required. This event can only accommodate a certain number of participants. One registration is good for one person. If you do not register, you cannot participate. Those on the waitlist will be contacted if a space becomes available.

Join us for a relaxing walk of Fresh Pond with Park Ranger Tim Puopolo! No two weeks are the same in nature, and Tim will share his insights about what's growing, changing, and blooming in the neighborhood. This walk is not on a paved path. We will walk on uneven terrain, down hills, and over roots. The meeting location for this walk will be in front of the Fresh Pond Ranger Station at 250 Fresh Pond Parkway (under the clock tower). Registration is required. This event can only accommodate a certain number of participants. One registration is good for one person. If you do not register, you cannot participate. Those on the waitlist will be contacted if a space becomes available.

Join us for a relaxing walk of Fresh Pond with Park Ranger Tim Puopolo! No two weeks are the same in nature, and Tim will share his insights about what's growing, changing, and blooming in the neighborhood. This walk is not on a paved path. We will walk on uneven terrain, down hills, and over roots. The meeting location for this walk will be in front of the Fresh Pond Ranger Station at 250 Fresh Pond Parkway (under the clock tower). Registration is required. This event can only accommodate a certain number of participants. One registration is good for one person. If you do not register, you cannot participate. Those on the waitlist will be contacted if a space becomes available.