I suspect that when a lot of people think of Shetland, they think of the Up Helly Aa festival in which a replica Viking ship is burned in a Lerwick swing park by a bunch of people in fancy dress. But there is another annual festival. Simmer Dim, the longest day of the year. There have been Simmer Dims when it was easily possible to play golf at midnight. Up Helly Aa used to be pretty much male dominated. Simmer Dim not so much. There was some stuff to do inside Fort Charlotte and then the fun would move to bonfires on the beach. All very relaxed and pleasant. By the way, the real roots of the present day Up Helly Aa only go back to Victorian times. There was a fire festival before that but the local Bourgeoisie didn't approve of it. That was because the old festival could sometimes climax with an unpopular shop keeper's premises in Lerwick getting a blazing barrel of tar through the window.