Midsommer

Midsommer is a 2003 psychological horror film directed by Carsten Myllerup and written by Rasmus Heisterberg. The story revolves around a group of Danish students who celebrate their graduation in a Swedish forest, when they encounter a supernatural presence seemingly connected to a friend who recently committed suicide. Six months after the film's release in 2003, the film rights were purchased by Bill Block for an American remake. The American version was reset to a Louisiana bayou and released in 2007 with the title Solstice.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.