On the edge of the Reinhard Forest, surrounded by nature, is the BdP center Immenhausen, about 15 km north of Kassel:
BdP Bundeszentrum Immenhausen
Kesselhaken 23
34376 Immenhausen

The "Jenseits der Siegel" (Beyond the Seals) takes place there from 30. May to 03. June 2018.

Google Maps

Approach:
Checkin on Wednesday, 30.05.2018: 10.00 till 22.00.

Time-in is at about 20.00.

Early Arrival
It is possible to arrive early at the Event site, gates open at Tuesday 29.05.2018 at 3 p.m.
The extra charge for each participant is 10,- Euros
Participants age 0-6 are free.
Participants age 7-13 pay half the price.
Early arrivers do not have to book in before the event, just arrive at the Check-In, show your ticket and pay the extra fee in cash.

For accommodations you have to bring your own tents in ambience style.