The festivals celebrated in Switzerland differ considerably depending on the season and the region. Some are based on ancient traditions while others have emerged only recently. Many of them reflect the course of the agricultural year, such as the ringing in of the vineyard workers in spring, the Alpine ascent and descent during the summer months, and the wine festivals, the ChAsteilet cheese sharing and the Alplerchilbi carnivals in autumn. Because there was less for farmers to do in winter than in other seasons, there were more celebrations and customs during this time. Even today, the expulsion of winter and of evil spirits and demons forms part of the tradition – a tradition that is linked to the numerous carnival and year-end ceremonies. Other celebrations recall historical events such as important victories in historical battles.