Closed Kitchens walking tour of Harvard Square, meeting at 1 and 3:30 p.m. Saturday at 56 Brattle St. (former site of The Window Shop), Harvard Square. Tickets are $10 for members of The Cambridge Historical Society, or $20 for non-members.

There’s a whole generation of Cantabrigians who haven’t stopped lamenting the loss of The Tasty, the 12-seat, 24-hour diner that hung around Harvard Square for eight decades and closed in 1996 – just after playing host to Will Hunting’s wooing of Skylar for “Good Will Hunting” coming out in 1997. But what about the Wursthaus? Or Gustie’s? The whole of the square’s lost culinary treasures can be visited in either of two Saturday tours led by researcher Mara Steinitz and illuminated by stories from accompanying former employees. Event information is here.

Empty Bowls (a benefit for Food for Free) from 5 to 8 p.m. Saturday at Mudflat Studio, 81 Broadway, Somerville. Tickets are $15 in advance or $18 at the door (or $50 per family of four in advance, $60 at the door).

The Cambridge nonprofit Food For Free, which rescues food going to waste and gets it to people who need it, offers a unique meal to benefit its programs: Each guest chooses a one-of-a-kind, handmade bowl for their meal’s soup that can be brought home afterward as a reminder of empty bowls and hungry bellies around the world. The soup that goes in the bowls (made in March by more than a dozen Mudflat studio artists), and the night’s food and drink are donated by local businesses including Cafe Luna, Cuisine En Locale, Craigie On Main, East End Grille, The Garden at the Cellar, The Hong Kong, Trader Joe’s Fresh Pond, UNO Harvard Square and Vinny’s. There will be live music at the event by Alembic, a harp and violin duo playing “mystic-folk and medieval sounds for the modern city”; and by bassist Tony Leva, singer/songwriter Jamie Mallari and cellist Valerie Thompson. Event information is here.

A Cappella Spring Benefit Jam for CRLS at 7 p.m. Saturday at Fitzgerald Auditorium, 459 Broadway. Tickets are $5.

This family-friendly, totally student-run benefit raises money for Artists for Humanity, which tries to “bridge economic, racial and social divisions by providing under-resourced youth with the keys to self-sufficiency through paid employment in the arts.” Four accomplished a cappella groups from the city’s public high school, Cambridge Rindge and Latin School, are scheduled to sing: Brocappella, Girls Next Door, Pitches & Do’s and Sassafras, and will be joined by the Wolfettes from Boston Latin and the Harvard Lowkeys. Event information is here.

https://www.youtube.com/watch?v=V41wJHP5Ljk&feature=youtu.be&t=3s

The People’s Battle: ImprovBoston Stand-Up Tournament at 9 p.m. Saturday and Sunday at ImprovBoston, 40 Prospect St., Central Square. Tickets are $12 for Saturdays and $10 for Sundays.

This is only the start of a two-month competition (held Saturdays and Sundays through the 10 p.m. May 30 finals) that puts 75 local comedians on the club’s two stages, where they will be judged by other local comedians and the audience. At the end of the brackets, the champion will headline his or her own run of shows, open for a national ImprovBoston Presents act, get an invitation to guest teach at the club’s school and win a year of free shows at the 30-year old nonprofit comedy theater.

Saturday’s competitors: Trey Burnham, Caitlin Durante, Ruth Ferrick, Doug Fitzgerald, Sam Ike, Scott McLaughlin, Chris Nakis, Mike O’Brien, Christa Weiss and Gypsy Howling Wolf. Sunday’s competitors: David Bartlett, Justin P. Drew, Dan Fitzpatrick, Brian Glowacki, Katie Goetsch, Adam Langlois, Jere Pilapil, Kate Procyshyn, Kristin Seltman and Dave Stern.

The Painted Burro Guac Off at 3 p.m. Sunday at The Painted Burro, 219 Elm St., Davis Square, Somerville.

A dozen guacamole recipes and their creators compete for bragging rights, a $150 gift card to The Painted Burro and a place on the restaurant’s menu. Customers get to judge alongside local celebrity judges including Somerville firefighter and winner of The Painted Burro’s Burro Churro Challenge Jay McKenzie, Somerville Scout writer Michelle Lahey and Jen Che of popular local food blog Tiny Urban Kitchen. There is no charge to take part in the judging, but participation is first-come, first-served.