Swedes traditionally celebrate their main holidays not on the Day but on the Eve of the holiday (Christmas Eve, New Year’s Eve, Midsummer Eve). The day before an official holiday is in most cases treated as a de facto holiday, so most employees working regular office hours do not work these days.
Thursday 30 April - May Eve (the eve of the first day of summer in the Northern hemisphere; Beltane begins at sunset in the Northern hemisphere, Samhain begins at sunset in the Southern hemisphere; Carodejnice in Czech Republic and Slovakia; Walpurgis Night - Central and Northern Europe)
Tuesday 23 June - St John's Eve and the first day of the Midsummer celebrations (Roman Catholic Church, Europe: - Bonfires of Saint John in Spain; Festa del Poble in Andorra; First night of Festa de São João do Porto; First day of Golowan Festival in Cornwall; Jaaniõhtu in Estonia; Jāņi in Latvia; Kupala Night in Belarus, Lithuania, Poland, Russia, Ukraine; Last day of Drăgaica fair in Buzău, Romania)
Wednesday 29 July - Olsok or St. Olaf's Day (King Olaf II Haraldsson of Norway is remembered as Rex perpetuus Norvegiae, the Eternal King of Norway. Olsok is a national day of celebration in the Nordic countries of Norway and the Faroe Islands, and also in the provinces of Härjedalen in Sweden and Savonlinna in Finland)
Wednesday 9 December - Anna's Day (Sweden, Finland and Norway. Marks the day to start the preparation process of the lutefisk to be consumed on Christmas Eve, as well as a Swedish name day, celebrating all people named Anna)