Wikipedia
Mysteryland is a series of electronic dance music festivals held by the Netherlands-based promoter ID&T. Being the first of its kind in the country when it was established, its organizers have billed the event as the oldest dance music festival in the Netherlands. It has most recently been held at Haarlemmermeerse Bos in Haarlemmermeer; an exhibition ground that hosted the 2002 edition of the Dutch gardening festival Floriade. It is traditionally held on the final Saturday of August; in 2013. It will begin its expansion into a two-day event by offering events on the preceding Friday. However, for the first year of this format, the first day will only be open to those who are camping on-site.
In 2011, an international edition of Mysteryland was held in Chile, the first to be held outside the Netherlands.
Over the Memorial Day weekend in May 2014, the first U.S. edition of Mysteryland was held at the Bethel Woods Center for the Arts, the site of the notable Woodstock festival held in 1969. Headliners included Kaskade, Moby, Steve Aoki, Dillon Francis, and Flosstradamus.
Since Mysteryland 2015 edition is it to visit for one weekend, during 29 and 30 August at the Floriade Park.