In a look ahead at a week of Cambridge and Somerville events, the vibe is strangely spooky with a Third Annual “Hafoween,” Crypt Night, Zombie Prom and Here Come the Mummies performing, but there’s also Arab American and Japanese festivals, a Glowball “anti-gala,” Taylor Swift trivia and comedian Emma Willmann.

Millipedes don’t have 1,000 legs – though biologists once found one with 1,306 legs hundreds of feet below ground – but if you are afraid of getting bitten, it’s centipedes that worry you, not these rather helpful nighttime dentrivores.

In a look ahead at a week of Cambridge and Somerville events, there’s Paul Giamatti’s “Chinwag” podcast, The Bread and Puppet Theater, Record Store Day, “Secret Sounds of Ponds” and other Earth-related events, cake decorating and Shakespeare’s 460th Birthday.

There are 220 million pet cats worldwide and even more strays, but that doesn’t mean you know why, how they get into odd places or – brace yourself – the reason street urchins would bring cats to the doors of a Harvard lab in the 1890s.

In a look ahead at a week of Cambridge and Somerville events, there’s Sri Lankan cooking, Susanna Kaysen and “Girl Interrupted” a “Little Prince” opera, a Patriots Day colonial fair, Space Week, Grolier Poetry history, a bluegrass festival and a Flat Top Johnny’s reopening pool party.

Many people worry – and rightly so – about deforestation, but wetlands where red-winged blackbirds live are disappearing three times faster than forests.

Public meetings this week look at Core Empowerment, a cannabis seller seeking to open in Magoun Square where K-2 Beer & Wine once had the same plan, and the design of development proposals on Prospect and Spring hills.

In a look ahead at a week of Cambridge and Somerville events, Jason Mantzoukas does improv comedy, Angélique Kidjo performs, there’s an archaeology fair, advice on how to run the Boston Marathon, the answer to “Can we grow buildings?” and an all-clarinet band.

American robins really are early birds. Besides being the earliest bird to start singing in the morning, they are one of the first to lay eggs in the spring.

In a look ahead at a week of Cambridge and Somerville events, there’s poet Nikki Giovanni, sex revolutionary Candida Royalle, joke fests and mystery comedy, new plays and folk metal, “Dope Science,” a tribute to Lana Del Rey and “Essays in Praise of Excess.”