Ascension day is the 40th day of Easter that commemorates the ascension of Jesus into heaven 39 days after resurrection on Easter Sunday. This holiday celebrated in several European countries and always falls on a Thursday. Sweden enjoys a 4-day holiday, as it also celebrates the Friday after the ascension day (and then you include the weekend).
There is myriad of traditions associated with this holiday, which might variate from country to country. In Sweden , for instance, an old tradition has it that people go into the woods very early in the morning to hear the birds at sunrise. It is said to be good luck if a cuckoo is heard from the east or west. An old English tradition is that if it is sunny on Ascension Day, it will be a warm summer; but if it rains, it will a poor harvest and livestock will suffer from disease [http://www.officeholidays.com/countries/europe/ascension_day.php].
Many establishments in Sweden are closed on Ascension day, shops, banks, museums and some restaurants, but groceries open up the following Friday. We’ve been very lucky with the weather this year, as it was sunny and up to + 20°C outside, which fact presented a great opportunity to enjoy a variety of outdoor activities. The KI Campus in Solna was as glorious as you could possibly imagine!