<P> Choral singing is a popular pastime in Sweden, and on Walpurgis Eve virtually every choir in the country is busy . Singing traditional songs of spring is widespread throughout the country . The songs are mostly from the 19th century and were spread by students' spring festivities . The strongest and most traditional spring festivities are also found in the old university cities, such as Uppsala and Lund, where undergraduates, graduates, and alumni gather at events that last most of the day from early morning to late night on April 30, or siste april ("The Last Day of April") as it is called in Lund, or sista april as it is called in Uppsala . For students, Walpurgis Eve heralds freedom . Traditionally the exams were over and only the odd lecture remained before term ends . On the last day of April, the students don their characteristic white caps and sing songs of welcome to spring, to the budding greenery and to a brighter future . </P> <P> More modern Valborg celebrations, particularly among Uppsala students, often consist of enjoying a breakfast including champagne and strawberries . During the day, people gather in parks, drink considerable amounts of alcoholic beverages, barbecue, and generally enjoy the weather, if it happens to be favorable . </P> <P> In Uppsala, since 1975, students honor spring by rafting on Fyrisån through the center of town with rickety, homemade, in fact quite easily wreckable, and often humorously decorated rafts . Several nations also hold "Champagne Races" (Swedish: Champagnegalopp), where students go to drink and spray champagne or somewhat more modestly priced sparkling wine on each other . The walls and floors of the old nation buildings are covered in plastic for this occasion, as the champagne is poured around recklessly and sometimes spilled enough to wade in . Spraying champagne is, however, a fairly recent addition to the Champagne Race . The name derives from the students running down the downhill slope from the Carolina Rediviva library, toward the Student Nations, to drink champagne . </P> <P> In Linköping many students and former students begin the day at the park Trädgårdföreningen, in the field below Belvederen where the city laws permits alcohol, to drink champagne breakfast in a similar way to Uppsala . Later at 15: 00 o'clock the students and public gather at the courtyard of Linköping Castle . Spring songs are sung by the Linköping University Male Voice Choir, and speeches are made by representatives of the students and the university professors . </P>

Who are the witches going to meet and when