The Painted Burro, an upscale Mexican restaurant in Somerville’s Davis Square, is adding its fourth location in a place familiar to fans of the cuisine: the former home of the Border Cafe in Harvard Square.

What keeps a family-owned, family-operated business going in Cambridge for 46 years and counting? Good timing helps – such as long ago buying the building that holds it – but so does customer service and customer loyalty, and a mix of flexibility and tradition.

A community walk through The Port neighborhood to learn about Cambridge’s black and brown history is the sole in-person event planned for Martin Luther King Jr. Day, the second to be celebrated during the pandemic. But there is more going on through Thursday, and all the events are free.

While there’s been a high rate of student absences since the end of a winter break that saw a surge in coronavirus cases, many school district staff are also in isolation due to Covid, including nurses and medical aides, putting additional pressure on administrators and staff.

The Cambridge Housing Authority has begun requiring employees who work in person to test themselves for coronavirus just before they start work, and it may have paid big dividends in preventing transmission of the virus. The requirement relies on employer-provided rapid antigen tests.

The Deconstructed Grilled Cheese & Tomato on the brunch menu at Source is a flat, lightly breaded mozzarella patty, fried and served in a tangy, slightly spicy tomato purée – and it’s quite brilliant.

For the second year in a row, Club Passim will take its beloved BCMFest online amid a meteoric rise in reported Covid cases.

Despite what Cambridge’s chief public health officer called “uncontrolled transmission” of Covid-19, the city won’t require restaurants, fitness centers and other indoor public spaces to mandate Covid-19 vaccination for their customers and workers, as Boston and neighboring communities have done.

Cambridge city workers don’t have to get vaccinated against Covid-19 to keep their jobs, but the city will make it easier for them to get a shot if they want one. The city plans three vaccination clinics specifically for Cambridge employees and their families this week.

A nonprofit that serves some of the most vulnerable in Cambridge and Somerville is pleading for volunteers to replace ones disappearing during a coronavirus spike.