What’s on: Fireworks, air show and Montreux Jazz

A selection of not-to-be-missed events around Switzerland as we approach the weekend, including the annual Montreux Jazz Festival – a must if you’ve never attended. Zurich decides that the city needs saving and reckons theatre is the art form to do it, while Payerne opens an aeronautical car-boot sale. And Le Locle – known as the most boring town in the country – attempts to prove otherwise.