Rock Climbing Circuit Challenge @ Bouldering Project, Somerville — Test your climbing with a community circuit challenge: clear all 8 preselected boulders at your level in a 3-hour window to earn a circuit badge | FREE • 6-9PM

Summer Kickoff Party @ Club Volo Assembly Row, Somerville — Boston Young Professionals' has booked Club Volo for a summer social kick off party. Open play pickleball, bocce, cornhole, and giant lawn games to a live DJ. Color-coded wristbands let you flag whether you're there to mingle, date, or just want to stop by | $22 • 6-9PM

Don't Tell Comedy @ Bow Market, Somerville — Roll the dice on a secret comedy lineup at Bow Market, with 4-7 mystery comics revealed only when they come on stage. Two back-to-back shows with location revealed the morning of | $30 • 7PM & 9PM

Yoga in the Park @ Baxter Park, Somerville — Riverfront yoga at Assembly Row with a free Saturday morning class led by YogaSix. BYO mat and water, tickets open every Friday at noon | FREE • 9:30-10:30AM

New England Hong Kong Festival @ Seven Hills Park, Somerville — Davis Square gets filled up as the annual Hong Kong Festival takes over with food, live performances, local vendors, and games | FREE • 11AM-5PM

Harvard Square MayFair @ Harvard Square, Cambridge — The 41st annual Harvard Square street fair takes over the neighborhood with live music, beer gardens, food, and crafts. Grammy-nominated Ari Hest headlines the main stage as thousands pack Cambridge | FREE • 11AM-6PM

AERA 5K/ Movement Social @ The Foundry, Cambridge — Try a casual 5K along the Charles with the AERA Daily Strava group, the Boston movement and wellness crew. Come run, jog, or walk; bring friends, family, your dog and get moving. Capped off at Nomu's Foundry popup for matcha and small bites | FREE • 11:30AM

Dink 'n' Date Pickleball Mixer @ Club Volo Assembly Row, Somerville — Volo keeps churning out sport socials and this one’s no different. Swap a night of Hinge for a paddle at this singles mixer. Rotating partners, lawn games and a social hour after | $11 • 12-1PM

12 Years of Aeronaut Celebration @ Aeronaut Brewing, Somerville — Aeronaut is celebrating its 12th year and you’re invited. Come through to a a daylong taproom takeover, a brand new anniversary IPA, live music, a birthday cake and even a magician roaming the floor | FREE • 12-7PM

AI Fluency: A Hands-On Skills Intensive @ Museum of Science, Boston/Cambridge — Get past basic ChatGPT prompts at this hands-on AI workshop from The AI Collective Group, covering how to direct tools like Claude and Gemini with precision. Working-lab format, jargon-free, just bring a laptop | $50 • 1-3PM or 3:30-5:30PM

Marvin's Dog Social Spring Yappy Hour @ The Lawn at Assembly Row, Somerville — Pop by The Lawn for a dog-friendly social hang featuring treats, a spring-themed photo setup, and a chance to meet local pet parents. Hosted by Mr. Marvin himself | FREE • 1-3PM

Sweat & Social Sundays: Pilates @ Club Volo, Somerville — Come try an all-levels Pilates flow that runs a quick 45 minutes and then rolls into a social hour. Whether you're a Pilates regular or just curious, come reset before the week kicks in | $14 • 9-10AM

Seedling Swap @ 37 Conwell Ave, Somerville — Swap and pick up summer seedlings from the MAMAS Gardening Collective, a follow-up to last month's seed swap. Bring seedlings if you have them, or just grab a few to start your garden | FREE • 12-4PM

13th Curated Vintage Market @ Bow Market, Somerville — 80+ vintage vendors from across New England take over Bow Market, Somerville Ave, and Union Tavern for a day of clothing, antiques, jewelry, and home decor | FREE • 12-8PM

Speed Dating: Ages 30-42 @ Theory Bar & Lounge, Cambridge — Try having actual conversations at this Kendall Square speed dating night hosted by Boston Single Mingle. Up to 14 five-minute dates, one drink included, matches sent within 24 hours | $43 • 6-8PM