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.

Public meetings and gatherings this week include Earth Day events, including a visit to Somerville’s growing Miyawaki Forest and a pollinator plan; a Narcan distribution; and Mystic River pathway and improvements at Draw 7 Park.

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.

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.

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.

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.” 

In a look ahead at a week of Cambridge and Somerville events, there’s the tiny-piano-using Chromic Duo and Cambridge Symphony Orchestra; robots, AI and eclipse prep; Joie de Vivre, horrors of the sea, edible insects and more; and Brexit and tech writer Kara Swisher.

In a look ahead at a week of Cambridge and Somerville events, there’s St. Patrick’s Day and Prince, choreography by Crispr DNA editing, the North Cambridge Family Opera, a Danehy Park documentary and fascination with fungi.

In a look ahead at a week of Cambridge and Somerville events, there’s an outdoors Parka Dance Party, comic book drag, music for St. Patrick’s Day, storytelling and brain science and visits from the Blind Boys of Alabama and Alan Cumming.

In a look ahead at a week of Cambridge and Somerville events, there’s a “Groundhog Day” Improv Show, We Black Folk music festival, a fermentation workshop (with sauerkraut!) and more fun science, Celeste Ng and Jas Hammonds readings, ice skating and play premieres to go apiary for (such as for “Bumbled”).