In a look ahead at a week of Cambridge and Somerville events, there’s a free pi day pie potluck, comedy against cancer, Mobius performance art called “Slay,” Ukrainian folk-rock, a St. Patrick’s fun ...

We also have them to thank for inventing the gin and tonic, which was also motivated by the need to make quinine palatable. (Photo: iStock/duncan1890) Tonic water didn’t stay in the medicine box for ...