There is the option of camping in your own caravan behind the halls during FEI World Cup Herning.
You purchase the camping spot and electricity for all days on worldcupherning.billetten.dk
Unfortunately the page is only in Danish, but you need to choose "Strøm til Camping", to get a camping spot and electricity for the whole period of FEI World Cup Herning.
If you have any questions, please do not hesitate to contact Danish Warmblood either by phone +45 8747 5400 or by mail.