In Switzerland the summer working hours change in April, when folk can work until 6pm. In Zurich they signal the new working hours and the beginning of Spring, by ringing a bell at 6pm (called the Sechseläuten). There is also a public holiday with a festival and a parade.
In case the bell is not sufficient, at the end of the parade the Swiss blow up a snowman called the Böögg (made from cotton, not snow)! They pack the snowman’s head with firecrackers and set it on top of a bonfire. At 6pm they set the pyre alight. It is said that the faster the fire reaches the snowman, and his head explodes, the finer the summer will be.