Today is midsummer's day, the longest day of the year, and an important holiday in Sweden. My favourite quote is "Midsummer rivals Christmas as the most important holiday of the year due to the copious amounts of alcohol consumed." Past experience has shown me this is true.
Until recently, it was always celebrated on June 24, which happens to be my birthday. Now the official midsummer's holiday (Midsommarafton) is always the Friday before the 24th.
I am fairly sure that, as I write this, my Swedish friends are nursing a hangover of some description. A German IKEA ad illustrates the typical holiday gathering in an instructive way.