Jónsmessa in Iceland
Jónsmessa in Iceland is held on June 24. This event in the third decade of the month June is annual. 
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Jónsmessa, or Midsummer Night, is celebrated today, June 24. According to Icelandic folklore, this night is one of the most magical nights of the year, along with Christmas Eve, New Year’s Eve and ‘þrettándinn’ (6 January): cows develop the capacity of speech and seals take on human form. Related to the solstice, the night is supposedly brimming with all things supernatural.
As superstition has it, rolling naked in the morning dew on Jónsmessa will cure people from all their ailments. Also, people were advised to pick medicinal herbs on this day as it would maximize their healing powers.
If you sit at four way crossroads, with all four ways leading to churches, you might connect with or meet supernatural beings like elves and seeresses.
Similar holidays and events, festivals and interesting facts
Icelandic National Day on June 17 (celebrates the independence of Iceland from Kingdom of Denmark in 1944);
National Coffee Day on September 29
Leif Erikson Day on October 9 (United States, Canada, Iceland and Norway);
World Romani Language Day on November 5
Father's Day in Estonia, Finland, Iceland, Norway, and Sweden on November 9 (Celebrated on the second Sunday in November);
Icelandic Language Day or Dagur íslenskrar tungu in Iceland on November 16
Iceland Self-governance Day or Fullveldisdagurinn on December 1